3157638 has 16 divisors (see below), whose sum is σ = 6889536. Its totient is φ = 956840.

The previous prime is 3157613. The next prime is 3157639. The reversal of 3157638 is 8367513.

It is a happy number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 3157599 and 3157608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3157639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23856 + ... + 23987.

It is an arithmetic number, because the mean of its divisors is an integer number (430596).

Almost surely, 2^3157638 is an apocalyptic number.

3157638 is an abundant number, since it is smaller than the sum of its proper divisors (3731898).

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

3157638 is a wasteful number, since it uses less digits than its factorization.

3157638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47859.

The product of its digits is 15120, while the sum is 33.

The square root of 3157638 is about 1776.9743948634. The cubic root of 3157638 is about 146.7081069769.

It can be divided in two parts, 3 and 157638, that added together give a triangular number (157641 = T₅₆₁).

The spelling of 3157638 in words is "three million, one hundred fifty-seven thousand, six hundred thirty-eight".