400106555 has 4 divisors (see below), whose sum is σ = 480127872. Its totient is φ = 320085240.

The previous prime is 400106527. The next prime is 400106557. The reversal of 400106555 is 555601004.

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

It is a de Polignac number, because none of the positive numbers 2^k-400106555 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400106557) 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, 40010651 + ... + 40010660.

It is an arithmetic number, because the mean of its divisors is an integer number (120031968).

Almost surely, 2^400106555 is an apocalyptic number.

400106555 is a deficient number, since it is larger than the sum of its proper divisors (80021317).

400106555 is an equidigital number, since it uses as much as digits as its factorization.

400106555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80021316.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 400106555 is about 20002.6636976179. The cubic root of 400106555 is about 736.8717192488.

Adding to 400106555 its reverse (555601004), we get a palindrome (955707559).

The spelling of 400106555 in words is "four hundred million, one hundred six thousand, five hundred fifty-five".