400105961 has 4 divisors (see below), whose sum is σ = 400218624. Its totient is φ = 399993300.

The previous prime is 400105943. The next prime is 400105967. The reversal of 400105961 is 169501004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 400105961 - 2¹⁸ = 399843817 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400105961.

It is not an unprimeable number, because it can be changed into a prime (400105967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50825 + ... + 58166.

It is an arithmetic number, because the mean of its divisors is an integer number (100054656).

Almost surely, 2^400105961 is an apocalyptic number.

It is an amenable number.

400105961 is a deficient number, since it is larger than the sum of its proper divisors (112663).

400105961 is a wasteful number, since it uses less digits than its factorization.

400105961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112662.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 400105961 is about 20002.6488495899. The cubic root of 400105961 is about 736.8713545943.

Adding to 400105961 its reverse (169501004), we get a palindrome (569606965).

The spelling of 400105961 in words is "four hundred million, one hundred five thousand, nine hundred sixty-one".