400420655 has 4 divisors (see below), whose sum is σ = 480504792. Its totient is φ = 320336520.

The previous prime is 400420627. The next prime is 400420679. The reversal of 400420655 is 556024004.

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

It is not a de Polignac number, because 400420655 - 2⁶ = 400420591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40042061 + ... + 40042070.

It is an arithmetic number, because the mean of its divisors is an integer number (120126198).

Almost surely, 2^400420655 is an apocalyptic number.

400420655 is a deficient number, since it is larger than the sum of its proper divisors (80084137).

400420655 is an equidigital number, since it uses as much as digits as its factorization.

400420655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80084136.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 400420655 is about 20010.5136115993. The cubic root of 400420655 is about 737.0644936188.

Adding to 400420655 its reverse (556024004), we get a palindrome (956444659).

The spelling of 400420655 in words is "four hundred million, four hundred twenty thousand, six hundred fifty-five".