401947278 has 16 divisors (see below), whose sum is σ = 804092880. Its totient is φ = 133949376.

The previous prime is 401947277. The next prime is 401947289. The reversal of 401947278 is 872749104.

It is a happy number.

It is a super-2 number, since 2×401947278² = 323123228583218568, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401947277) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38076 + ... + 47472.

It is an arithmetic number, because the mean of its divisors is an integer number (50255805).

Almost surely, 2^401947278 is an apocalyptic number.

401947278 is an abundant number, since it is smaller than the sum of its proper divisors (402145602).

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

401947278 is a wasteful number, since it uses less digits than its factorization.

401947278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16531.

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 401947278 is about 20048.6228454725. The cubic root of 401947278 is about 738.0000036721. Note that the first 5 decimals are identical.

The spelling of 401947278 in words is "four hundred one million, nine hundred forty-seven thousand, two hundred seventy-eight".