40388087 has 4 divisors (see below), whose sum is σ = 41247456. Its totient is φ = 39528720.

The previous prime is 40388083. The next prime is 40388099. The reversal of 40388087 is 78088304.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40388087 - 2² = 40388083 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40388087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40388081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 429614 + ... + 429707.

It is an arithmetic number, because the mean of its divisors is an integer number (10311864).

Almost surely, 2^40388087 is an apocalyptic number.

40388087 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

40388087 is a deficient number, since it is larger than the sum of its proper divisors (859369).

40388087 is an equidigital number, since it uses as much as digits as its factorization.

40388087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859368.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 40388087 is about 6355.1622323903. The cubic root of 40388087 is about 343.0976639105.

The spelling of 40388087 in words is "forty million, three hundred eighty-eight thousand, eighty-seven".