400242555 has 12 divisors (see below), whose sum is σ = 693753840. Its totient is φ = 213462672.

The previous prime is 400242529. The next prime is 400242559. The reversal of 400242555 is 555242004.

400242555 is a `hidden beast` number, since 400 + 2 + 4 + 255 + 5 = 666.

It is not a de Polignac number, because 400242555 - 2¹² = 400238459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400242559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4447095 + ... + 4447184.

It is an arithmetic number, because the mean of its divisors is an integer number (57812820).

Almost surely, 2^400242555 is an apocalyptic number.

400242555 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

400242555 is a deficient number, since it is larger than the sum of its proper divisors (293511285).

400242555 is a wasteful number, since it uses less digits than its factorization.

400242555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8894290 (or 8894287 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 27.

The square root of 400242555 is about 20006.0629560141. The cubic root of 400242555 is about 736.9551996785.

Adding to 400242555 its reverse (555242004), we get a palindrome (955484559).

The spelling of 400242555 in words is "four hundred million, two hundred forty-two thousand, five hundred fifty-five".