401777867 has 2 divisors, whose sum is σ = 401777868. Its totient is φ = 401777866.

The previous prime is 401777837. The next prime is 401777879. The reversal of 401777867 is 768777104.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 401777867 - 2⁸ = 401777611 is a prime.

It is a super-2 number, since 2×401777867² = 322850908822139378, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401777807) 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, 200888933 + 200888934.

It is an arithmetic number, because the mean of its divisors is an integer number (200888934).

Almost surely, 2^401777867 is an apocalyptic number.

401777867 is a deficient number, since it is larger than the sum of its proper divisors (1).

401777867 is an equidigital number, since it uses as much as digits as its factorization.

401777867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 460992, while the sum is 47.

The square root of 401777867 is about 20044.3973967790. The cubic root of 401777867 is about 737.8963060857.

The spelling of 401777867 in words is "four hundred one million, seven hundred seventy-seven thousand, eight hundred sixty-seven".