400498978 has 8 divisors (see below), whose sum is σ = 655362000. Its totient is φ = 182044980.

The previous prime is 400498963. The next prime is 400498981. The reversal of 400498978 is 879894004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9102228 + ... + 9102271.

It is an arithmetic number, because the mean of its divisors is an integer number (81920250).

Almost surely, 2^400498978 is an apocalyptic number.

400498978 is a deficient number, since it is larger than the sum of its proper divisors (254863022).

400498978 is a wasteful number, since it uses less digits than its factorization.

400498978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18204512.

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 400498978 is about 20012.4705621270. The cubic root of 400498978 is about 737.1125475324.

The spelling of 400498978 in words is "four hundred million, four hundred ninety-eight thousand, nine hundred seventy-eight".