400919891 has 8 divisors (see below), whose sum is σ = 424678320. Its totient is φ = 377180928.

The previous prime is 400919879. The next prime is 400919899. The reversal of 400919891 is 198919004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400919891 - 2¹⁴ = 400903507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400919899) 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 in 7 ways as a sum of consecutive naturals, for example, 77900 + ... + 82886.

It is an arithmetic number, because the mean of its divisors is an integer number (53084790).

Almost surely, 2^400919891 is an apocalyptic number.

400919891 is a deficient number, since it is larger than the sum of its proper divisors (23758429).

400919891 is a wasteful number, since it uses less digits than its factorization.

400919891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9733.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 400919891 is about 20022.9840683151. The cubic root of 400919891 is about 737.3706852079.

The spelling of 400919891 in words is "four hundred million, nine hundred nineteen thousand, eight hundred ninety-one".