401239873 has 2 divisors, whose sum is σ = 401239874. Its totient is φ = 401239872.

The previous prime is 401239843. The next prime is 401239879. The reversal of 401239873 is 378932104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 314991504 + 86248369 = 17748^2 + 9287^2 .

It is a cyclic number.

It is not a de Polignac number, because 401239873 - 2⁵ = 401239841 is a prime.

It is a super-2 number, since 2×401239873² = 321986871370112258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401239879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200619936 + 200619937.

It is an arithmetic number, because the mean of its divisors is an integer number (200619937).

Almost surely, 2^401239873 is an apocalyptic number.

It is an amenable number.

401239873 is a deficient number, since it is larger than the sum of its proper divisors (1).

401239873 is an equidigital number, since it uses as much as digits as its factorization.

401239873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 401239873 is about 20030.9728420763. The cubic root of 401239873 is about 737.5668030266.

The spelling of 401239873 in words is "four hundred one million, two hundred thirty-nine thousand, eight hundred seventy-three".