3138720 has 96 divisors (see below), whose sum is σ = 10668672. Its totient is φ = 771072.

The previous prime is 3138691. The next prime is 3138767. The reversal of 3138720 is 278313.

3138720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

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 15 ways as a sum of consecutive naturals, for example, 5989 + ... + 6491.

It is an arithmetic number, because the mean of its divisors is an integer number (111132).

Almost surely, 2^3138720 is an apocalyptic number.

3138720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3138720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5334336).

3138720 is an abundant number, since it is smaller than the sum of its proper divisors (7529952).

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

3138720 is a wasteful number, since it uses less digits than its factorization.

3138720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534 (or 526 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 3138720 is about 1771.6433049573. The cubic root of 3138720 is about 146.4145346733.

The spelling of 3138720 in words is "three million, one hundred thirty-eight thousand, seven hundred twenty".