40399425 has 48 divisors (see below), whose sum is σ = 80976960. Its totient is φ = 19584000.

The previous prime is 40399399. The next prime is 40399427. The reversal of 40399425 is 52499304.

It is not a de Polignac number, because 40399425 - 2⁵ = 40399393 is a prime.

It is a super-2 number, since 2×40399425² = 3264227080661250, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40399425.

It is not an unprimeable number, because it can be changed into a prime (40399427) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4705 + ... + 10145.

It is an arithmetic number, because the mean of its divisors is an integer number (1687020).

Almost surely, 2^40399425 is an apocalyptic number.

40399425 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40399425 is an abundant number, since it is smaller than the sum of its proper divisors (40577535).

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

40399425 is a wasteful number, since it uses less digits than its factorization.

40399425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5471 (or 5460 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 40399425 is about 6356.0542005241. The cubic root of 40399425 is about 343.1297664243.

The spelling of 40399425 in words is "forty million, three hundred ninety-nine thousand, four hundred twenty-five".