401877979 has 4 divisors (see below), whose sum is σ = 412739584. Its totient is φ = 391016376.

The previous prime is 401877961. The next prime is 401877989. The reversal of 401877979 is 979778104.

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

It is a cyclic number.

It is not a de Polignac number, because 401877979 - 2¹¹ = 401875931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401877929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5430747 + ... + 5430820.

It is an arithmetic number, because the mean of its divisors is an integer number (103184896).

Almost surely, 2^401877979 is an apocalyptic number.

401877979 is a deficient number, since it is larger than the sum of its proper divisors (10861605).

401877979 is a wasteful number, since it uses less digits than its factorization.

401877979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10861604.

The product of its (nonzero) digits is 889056, while the sum is 52.

The square root of 401877979 is about 20046.8944976522. The cubic root of 401877979 is about 737.9575888212.

The spelling of 401877979 in words is "four hundred one million, eight hundred seventy-seven thousand, nine hundred seventy-nine".