3129420 has 48 divisors (see below), whose sum is σ = 10015488. Its totient is φ = 715200.

The previous prime is 3129391. The next prime is 3129421. The reversal of 3129420 is 249213.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (3129421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3306 + ... + 4145.

It is an arithmetic number, because the mean of its divisors is an integer number (208656).

Almost surely, 2^3129420 is an apocalyptic number.

3129420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3129420 is an abundant number, since it is smaller than the sum of its proper divisors (6886068).

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

3129420 is a wasteful number, since it uses less digits than its factorization.

3129420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7470 (or 7468 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 3129420 is about 1769.0166760096. The cubic root of 3129420 is about 146.2697832833.

The spelling of 3129420 in words is "three million, one hundred twenty-nine thousand, four hundred twenty".