40399857 has 8 divisors (see below), whose sum is σ = 59851680. Its totient is φ = 26933220.

The previous prime is 40399841. The next prime is 40399901. The reversal of 40399857 is 75899304.

It is not a de Polignac number, because 40399857 - 2⁴ = 40399841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40399817) 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, 748119 + ... + 748172.

It is an arithmetic number, because the mean of its divisors is an integer number (7481460).

Almost surely, 2^40399857 is an apocalyptic number.

It is an amenable number.

40399857 is a deficient number, since it is larger than the sum of its proper divisors (19451823).

40399857 is a wasteful number, since it uses less digits than its factorization.

40399857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1496300 (or 1496294 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 40399857 is about 6356.0881837810. The cubic root of 40399857 is about 343.1309894741.

The spelling of 40399857 in words is "forty million, three hundred ninety-nine thousand, eight hundred fifty-seven".