497139978 has 32 divisors (see below), whose sum is σ = 1056997440. Its totient is φ = 155433600.

The previous prime is 497139971. The next prime is 497139989. The reversal of 497139978 is 879931794.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (497139971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10075 + ... + 33102.

It is an arithmetic number, because the mean of its divisors is an integer number (33031170).

Almost surely, 2^497139978 is an apocalyptic number.

497139978 is an abundant number, since it is smaller than the sum of its proper divisors (559857462).

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

497139978 is a wasteful number, since it uses less digits than its factorization.

497139978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43302.

The product of its digits is 3429216, while the sum is 57.

The square root of 497139978 is about 22296.6360242975. The cubic root of 497139978 is about 792.1842973568.

The spelling of 497139978 in words is "four hundred ninety-seven million, one hundred thirty-nine thousand, nine hundred seventy-eight".