400609655 has 4 divisors (see below), whose sum is σ = 480731592. Its totient is φ = 320487720.

The previous prime is 400609637. The next prime is 400609663. The reversal of 400609655 is 556906004.

It is a happy number.

400609655 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 400609655 - 2⁶ = 400609591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 40060961 + ... + 40060970.

It is an arithmetic number, because the mean of its divisors is an integer number (120182898).

Almost surely, 2^400609655 is an apocalyptic number.

400609655 is a deficient number, since it is larger than the sum of its proper divisors (80121937).

400609655 is an equidigital number, since it uses as much as digits as its factorization.

400609655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80121936.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 400609655 is about 20015.2355719337. The cubic root of 400609655 is about 737.1804410820.

The spelling of 400609655 in words is "four hundred million, six hundred nine thousand, six hundred fifty-five".