39857428 has 24 divisors (see below), whose sum is σ = 75869640. Its totient is φ = 18211200.

The previous prime is 39857423. The next prime is 39857443. The reversal of 39857428 is 82475893.

It can be written as a sum of positive squares in 4 ways, for example, as 944784 + 38912644 = 972^2 + 6238^2 .

It is a super-2 number, since 2×39857428² = 3177229133550368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39857423) 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, 1458 + ... + 9046.

It is an arithmetic number, because the mean of its divisors is an integer number (3161235).

Almost surely, 2^39857428 is an apocalyptic number.

It is an amenable number.

39857428 is a deficient number, since it is larger than the sum of its proper divisors (36012212).

39857428 is a wasteful number, since it uses less digits than its factorization.

39857428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7707 (or 7705 counting only the distinct ones).

The product of its digits is 483840, while the sum is 46.

The square root of 39857428 is about 6313.2739525543. The cubic root of 39857428 is about 341.5883811386.

The spelling of 39857428 in words is "thirty-nine million, eight hundred fifty-seven thousand, four hundred twenty-eight".