40399623 has 12 divisors (see below), whose sum is σ = 63660168. Its totient is φ = 24484560.

The previous prime is 40399613. The next prime is 40399631. The reversal of 40399623 is 32699304.

It is a happy number.

It is not a de Polignac number, because 40399623 - 2⁵ = 40399591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40399613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 203940 + ... + 204137.

It is an arithmetic number, because the mean of its divisors is an integer number (5305014).

Almost surely, 2^40399623 is an apocalyptic number.

40399623 is a deficient number, since it is larger than the sum of its proper divisors (23260545).

40399623 is a wasteful number, since it uses less digits than its factorization.

40399623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408094 (or 408091 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 36.

The square root of 40399623 is about 6356.0697762060. The cubic root of 40399623 is about 343.1303269899.

The spelling of 40399623 in words is "forty million, three hundred ninety-nine thousand, six hundred twenty-three".