40402320 has 80 divisors (see below), whose sum is σ = 143145600. Its totient is φ = 9234432.

The previous prime is 40402309. The next prime is 40402333. The reversal of 40402320 is 2320404.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×40402320² = 3264694922764800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 40402320.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10345 + ... + 13704.

It is an arithmetic number, because the mean of its divisors is an integer number (1789320).

Almost surely, 2^40402320 is an apocalyptic number.

40402320 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40402320 is an abundant number, since it is smaller than the sum of its proper divisors (102743280).

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

40402320 is a wasteful number, since it uses less digits than its factorization.

40402320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24072 (or 24066 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 40402320 is about 6356.2819320732. The cubic root of 40402320 is about 343.1379623903.

Adding to 40402320 its reverse (2320404), we get a palindrome (42722724).

The spelling of 40402320 in words is "forty million, four hundred two thousand, three hundred twenty".