400779495 has 20 divisors (see below), whose sum is σ = 718435080. Its totient is φ = 213748848.

The previous prime is 400779487. The next prime is 400779497. The reversal of 400779495 is 594977004.

400779495 is a `hidden beast` number, since 400 + 77 + 94 + 95 = 666.

It is not a de Polignac number, because 400779495 - 2³ = 400779487 is a prime.

It is a super-2 number, since 2×400779495² = 321248407224910050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 400779495.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400779497) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 494385 + ... + 495194.

It is an arithmetic number, because the mean of its divisors is an integer number (35921754).

Almost surely, 2^400779495 is an apocalyptic number.

400779495 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

400779495 is a deficient number, since it is larger than the sum of its proper divisors (317655585).

400779495 is an equidigital number, since it uses as much as digits as its factorization.

400779495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989596 (or 989587 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 400779495 is about 20019.4778902947. The cubic root of 400779495 is about 737.2846031887.

The spelling of 400779495 in words is "four hundred million, seven hundred seventy-nine thousand, four hundred ninety-five".