401739889 has 2 divisors, whose sum is σ = 401739890. Its totient is φ = 401739888.

The previous prime is 401739851. The next prime is 401739901. The reversal of 401739889 is 988937104.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210830400 + 190909489 = 14520^2 + 13817^2 .

It is a cyclic number.

It is not a de Polignac number, because 401739889 - 2⁷ = 401739761 is a prime.

It is a super-2 number, since 2×401739889² = 322789876827464642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401739089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200869944 + 200869945.

It is an arithmetic number, because the mean of its divisors is an integer number (200869945).

Almost surely, 2^401739889 is an apocalyptic number.

It is an amenable number.

401739889 is a deficient number, since it is larger than the sum of its proper divisors (1).

401739889 is an equidigital number, since it uses as much as digits as its factorization.

401739889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 401739889 is about 20043.4500273780. The cubic root of 401739889 is about 737.8730555027.

The spelling of 401739889 in words is "four hundred one million, seven hundred thirty-nine thousand, eight hundred eighty-nine".