400663655 has 8 divisors (see below), whose sum is σ = 549481632. Its totient is φ = 274740768.

The previous prime is 400663651. The next prime is 400663661. The reversal of 400663655 is 556366004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400663655 - 2² = 400663651 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 11447533 = 400663655 / (4 + 0 + 0 + 6 + 6 + 3 + 6 + 5 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400663651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5723732 + ... + 5723801.

It is an arithmetic number, because the mean of its divisors is an integer number (68685204).

Almost surely, 2^400663655 is an apocalyptic number.

400663655 is a deficient number, since it is larger than the sum of its proper divisors (148817977).

400663655 is a wasteful number, since it uses less digits than its factorization.

400663655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11447545.

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 400663655 is about 20016.5844988599. The cubic root of 400663655 is about 737.2135622303.

The spelling of 400663655 in words is "four hundred million, six hundred sixty-three thousand, six hundred fifty-five".