401979971 has 4 divisors (see below), whose sum is σ = 403194744. Its totient is φ = 400765200.

The previous prime is 401979923. The next prime is 401979973. The reversal of 401979971 is 179979104.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401979971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401979973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 606890 + ... + 607551.

It is an arithmetic number, because the mean of its divisors is an integer number (100798686).

Almost surely, 2^401979971 is an apocalyptic number.

401979971 is a deficient number, since it is larger than the sum of its proper divisors (1214773).

401979971 is a wasteful number, since it uses less digits than its factorization.

401979971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1214772.

The product of its (nonzero) digits is 142884, while the sum is 47.

The square root of 401979971 is about 20049.4381716795. The cubic root of 401979971 is about 738.0200119181.

The spelling of 401979971 in words is "four hundred one million, nine hundred seventy-nine thousand, nine hundred seventy-one".