40388520 has 32 divisors (see below), whose sum is σ = 121165920. Its totient is φ = 10770240.

The previous prime is 40388519. The next prime is 40388599. The reversal of 40388520 is 2588304.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168166 + ... + 168405.

It is an arithmetic number, because the mean of its divisors is an integer number (3786435).

Almost surely, 2^40388520 is an apocalyptic number.

40388520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40388520 is an abundant number, since it is smaller than the sum of its proper divisors (80777400).

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

40388520 is a wasteful number, since it uses less digits than its factorization.

40388520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336585 (or 336581 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 40388520 is about 6355.1962990926. The cubic root of 40388520 is about 343.0988900209.

The spelling of 40388520 in words is "forty million, three hundred eighty-eight thousand, five hundred twenty".