401939999 has 2 divisors, whose sum is σ = 401940000. Its totient is φ = 401939998.

The previous prime is 401939987. The next prime is 401940013. The reversal of 401939999 is 999939104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 401939999 - 2²⁴ = 385162783 is a prime.

It is a super-2 number, since 2×401939999² = 323111525592240002, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 401939999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401939929) 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 as a sum of consecutive naturals, namely, 200969999 + 200970000.

It is an arithmetic number, because the mean of its divisors is an integer number (200970000).

Almost surely, 2^401939999 is an apocalyptic number.

401939999 is a deficient number, since it is larger than the sum of its proper divisors (1).

401939999 is an equidigital number, since it uses as much as digits as its factorization.

401939999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 708588, while the sum is 53.

The square root of 401939999 is about 20048.4413109848. The cubic root of 401939999 is about 737.9955487475.

The spelling of 401939999 in words is "four hundred one million, nine hundred thirty-nine thousand, nine hundred ninety-nine".