400978395 has 24 divisors (see below), whose sum is σ = 703409616. Its totient is φ = 211276608.

The previous prime is 400978381. The next prime is 400978399. The reversal of 400978395 is 593879004.

It is not a de Polignac number, because 400978395 - 2⁴ = 400978379 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 400978395.

It is not an unprimeable number, because it can be changed into a prime (400978399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49944 + ... + 57413.

It is an arithmetic number, because the mean of its divisors is an integer number (29308734).

Almost surely, 2^400978395 is an apocalyptic number.

400978395 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

400978395 is a deficient number, since it is larger than the sum of its proper divisors (302431221).

400978395 is a wasteful number, since it uses less digits than its factorization.

400978395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107451 (or 107448 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 400978395 is about 20024.4449361274. Note that the first 3 decimals coincide. The cubic root of 400978395 is about 737.4065502584.

The spelling of 400978395 in words is "four hundred million, nine hundred seventy-eight thousand, three hundred ninety-five".