401989995 has 24 divisors (see below), whose sum is σ = 760127472. Its totient is φ = 194904000.

The previous prime is 401989981. The next prime is 401989997. The reversal of 401989995 is 599989104.

It is not a de Polignac number, because 401989995 - 2⁴ = 401989979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (401989997) 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 23 ways as a sum of consecutive naturals, for example, 405556 + ... + 406545.

It is an arithmetic number, because the mean of its divisors is an integer number (31671978).

Almost surely, 2^401989995 is an apocalyptic number.

401989995 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

401989995 is a deficient number, since it is larger than the sum of its proper divisors (358137477).

401989995 is a wasteful number, since it uses less digits than its factorization.

401989995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812123 (or 812120 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 54.

The square root of 401989995 is about 20049.6881521883. The cubic root of 401989995 is about 738.0261464286.

The spelling of 401989995 in words is "four hundred one million, nine hundred eighty-nine thousand, nine hundred ninety-five".