400756849 has 4 divisors (see below), whose sum is σ = 401661936. Its totient is φ = 399851764.

The previous prime is 400756843. The next prime is 400756859. The reversal of 400756849 is 948657004.

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 400756849 - 2⁵ = 400756817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400756843) 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, 451879 + ... + 452764.

It is an arithmetic number, because the mean of its divisors is an integer number (100415484).

Almost surely, 2^400756849 is an apocalyptic number.

It is an amenable number.

400756849 is a deficient number, since it is larger than the sum of its proper divisors (905087).

400756849 is an equidigital number, since it uses as much as digits as its factorization.

400756849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905086.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 400756849 is about 20018.9122831387. The cubic root of 400756849 is about 737.2707161995.

The spelling of 400756849 in words is "four hundred million, seven hundred fifty-six thousand, eight hundred forty-nine".