40257138 has 16 divisors (see below), whose sum is σ = 81297216. Its totient is φ = 13288560.

The previous prime is 40257109. The next prime is 40257163. The reversal of 40257138 is 83175204.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31953 + ... + 33188.

It is an arithmetic number, because the mean of its divisors is an integer number (5081076).

Almost surely, 2^40257138 is an apocalyptic number.

40257138 is an abundant number, since it is smaller than the sum of its proper divisors (41040078).

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

40257138 is a wasteful number, since it uses less digits than its factorization.

40257138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65249.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 40257138 is about 6344.8512984939. The cubic root of 40257138 is about 342.7264575845.

The spelling of 40257138 in words is "forty million, two hundred fifty-seven thousand, one hundred thirty-eight".