40393857 has 16 divisors (see below), whose sum is σ = 61662080. Its totient is φ = 23041152.

The previous prime is 40393841. The next prime is 40393877. The reversal of 40393857 is 75839304.

It is not a de Polignac number, because 40393857 - 2⁴ = 40393841 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40393877) 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, 13533 + ... + 16245.

It is an arithmetic number, because the mean of its divisors is an integer number (3853880).

Almost surely, 2^40393857 is an apocalyptic number.

It is an amenable number.

40393857 is a deficient number, since it is larger than the sum of its proper divisors (21268223).

40393857 is a wasteful number, since it uses less digits than its factorization.

40393857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3432.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 40393857 is about 6355.6161778383. The cubic root of 40393857 is about 343.1140018903.

The spelling of 40393857 in words is "forty million, three hundred ninety-three thousand, eight hundred fifty-seven".