40390372 has 24 divisors (see below), whose sum is σ = 77353920. Its totient is φ = 18300960.

The previous prime is 40390367. The next prime is 40390379. The reversal of 40390372 is 27309304.

It is a self number, because there is not a number n which added to its sum of digits gives 40390372.

It is not an unprimeable number, because it can be changed into a prime (40390379) 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, 14518 + ... + 17074.

It is an arithmetic number, because the mean of its divisors is an integer number (3223080).

Almost surely, 2^40390372 is an apocalyptic number.

It is an amenable number.

40390372 is a deficient number, since it is larger than the sum of its proper divisors (36963548).

40390372 is a wasteful number, since it uses less digits than its factorization.

40390372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2931 (or 2929 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 40390372 is about 6355.3420049593. The cubic root of 40390372 is about 343.1041341631.

Adding to 40390372 its reverse (27309304), we get a palindrome (67699676).

The spelling of 40390372 in words is "forty million, three hundred ninety thousand, three hundred seventy-two".