404220974978 has 6 divisors (see below), whose sum is σ = 606332811171. Its totient is φ = 202110037922.

The previous prime is 404220974951. The next prime is 404220974981. The reversal of 404220974978 is 879479022404.

It can be written as a sum of positive squares in only one way, i.e., 202110487489 + 202110487489 = 449567^2 + 449567^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=449567.

It is a super-2 number, since 2×404220974978² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 674351 + ... + 1123917.

Almost surely, 2^404220974978 is an apocalyptic number.

404220974978 is a deficient number, since it is larger than the sum of its proper divisors (202111836193).

404220974978 is an frugal number, since it uses more digits than its factorization.

404220974978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899136 (or 449569 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 56.

The spelling of 404220974978 in words is "four hundred four billion, two hundred twenty million, nine hundred seventy-four thousand, nine hundred seventy-eight".