401280015987 has 24 divisors (see below), whose sum is σ = 582992558720. Its totient is φ = 265970200320.

The previous prime is 401280015953. The next prime is 401280016051. The reversal of 401280015987 is 789510082104.

401280015987 is a `hidden beast` number, since 40 + 12 + 8 + 0 + 0 + 1 + 598 + 7 = 666.

It is not a de Polignac number, because 401280015987 - 2¹⁰ = 401280014963 is a prime.

It is a super-2 number, since 2×401280015987² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401282015987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1164189 + ... + 1468977.

Almost surely, 2^401280015987 is an apocalyptic number.

401280015987 is a deficient number, since it is larger than the sum of its proper divisors (181712542733).

401280015987 is a wasteful number, since it uses less digits than its factorization.

401280015987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305643 (or 305640 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 401280015987 in words is "four hundred one billion, two hundred eighty million, fifteen thousand, nine hundred eighty-seven".