401667787 has 2 divisors, whose sum is σ = 401667788. Its totient is φ = 401667786.

The previous prime is 401667727. The next prime is 401667817. The reversal of 401667787 is 787766104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 401667787 - 2⁷ = 401667659 is a prime.

It is a super-2 number, since 2×401667787² = 322674022226954738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401667727) 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, 200833893 + 200833894.

It is an arithmetic number, because the mean of its divisors is an integer number (200833894).

Almost surely, 2^401667787 is an apocalyptic number.

401667787 is a deficient number, since it is larger than the sum of its proper divisors (1).

401667787 is an equidigital number, since it uses as much as digits as its factorization.

401667787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 395136, while the sum is 46.

The square root of 401667787 is about 20041.6513042214. The cubic root of 401667787 is about 737.8289097693.

The spelling of 401667787 in words is "four hundred one million, six hundred sixty-seven thousand, seven hundred eighty-seven".