401680981 has 16 divisors (see below), whose sum is σ = 472808448. Its totient is φ = 337708800.

The previous prime is 401680973. The next prime is 401680997. The reversal of 401680981 is 189086104.

It is a happy number.

It is not a de Polignac number, because 401680981 - 2³ = 401680973 is a prime.

It is a super-2 number, since 2×401680981² = 322695220994244722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 401680981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401680381) 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, 22465 + ... + 36166.

It is an arithmetic number, because the mean of its divisors is an integer number (29550528).

Almost surely, 2^401680981 is an apocalyptic number.

It is an amenable number.

401680981 is a deficient number, since it is larger than the sum of its proper divisors (71127467).

401680981 is a wasteful number, since it uses less digits than its factorization.

401680981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58692.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 401680981 is about 20041.9804660118. The cubic root of 401680981 is about 737.8369884256.

The spelling of 401680981 in words is "four hundred one million, six hundred eighty thousand, nine hundred eighty-one".