3129870 has 72 divisors (see below), whose sum is σ = 8421624. Its totient is φ = 744192.

The previous prime is 3129859. The next prime is 3129911. The reversal of 3129870 is 789213.

It is a happy number.

3129870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 164721 + ... + 164739.

It is an arithmetic number, because the mean of its divisors is an integer number (116967).

Almost surely, 2^3129870 is an apocalyptic number.

3129870 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 3129870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4210812).

3129870 is an abundant number, since it is smaller than the sum of its proper divisors (5291754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3129870 is a wasteful number, since it uses less digits than its factorization.

3129870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82 (or 46 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 3129870 is about 1769.1438607417. The cubic root of 3129870 is about 146.2767939805.

Multiplying 3129870 by its sum of digits (30), we get a square (93896100 = 9690²).

3129870 divided by its sum of digits (30) gives a square (104329 = 323²).

The spelling of 3129870 in words is "three million, one hundred twenty-nine thousand, eight hundred seventy".