400903138 has 16 divisors (see below), whose sum is σ = 620244864. Its totient is φ = 194239600.

The previous prime is 400903121. The next prime is 400903169. The reversal of 400903138 is 831309004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11620 + ... + 30607.

It is an arithmetic number, because the mean of its divisors is an integer number (38765304).

Almost surely, 2^400903138 is an apocalyptic number.

400903138 is a deficient number, since it is larger than the sum of its proper divisors (219341726).

400903138 is a wasteful number, since it uses less digits than its factorization.

400903138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42377.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 400903138 is about 20022.5657197074. The cubic root of 400903138 is about 737.3604143754.

The spelling of 400903138 in words is "four hundred million, nine hundred three thousand, one hundred thirty-eight".