401872019 has 2 divisors, whose sum is σ = 401872020. Its totient is φ = 401872018.

The previous prime is 401872001. The next prime is 401872033. The reversal of 401872019 is 910278104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 401872019 - 2¹² = 401867923 is a prime.

It is a super-2 number, since 2×401872019² = 323002239310272722, which contains 22 as substring.

It is a Chen prime.

It is equal to p_21430697 and since 401872019 and 21430697 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (401872049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200936009 + 200936010.

It is an arithmetic number, because the mean of its divisors is an integer number (200936010).

Almost surely, 2^401872019 is an apocalyptic number.

401872019 is a deficient number, since it is larger than the sum of its proper divisors (1).

401872019 is an equidigital number, since it uses as much as digits as its factorization.

401872019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 401872019 is about 20046.7458456479. The cubic root of 401872019 is about 737.9539407412.

The spelling of 401872019 in words is "four hundred one million, eight hundred seventy-two thousand, nineteen".