401979 has 4 divisors (see below), whose sum is σ = 535976. Its totient is φ = 267984.

The previous prime is 401959. The next prime is 401981. The reversal of 401979 is 979104.

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

It is not a de Polignac number, because 401979 - 2¹⁵ = 369211 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401909) 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, 66994 + ... + 66999.

It is an arithmetic number, because the mean of its divisors is an integer number (133994).

2⁴⁰¹⁹⁷⁹ is an apocalyptic number.

401979 is a deficient number, since it is larger than the sum of its proper divisors (133997).

401979 is a wasteful number, since it uses less digits than its factorization.

401979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133996.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 401979 is about 634.0181385418. The cubic root of 401979 is about 73.8019417678.

The spelling of 401979 in words is "four hundred one thousand, nine hundred seventy-nine".