400012554 has 24 divisors (see below), whose sum is σ = 804334752. Its totient is φ = 132621720.

The previous prime is 400012541. The next prime is 400012583. The reversal of 400012554 is 455210004.

It is a self number, because there is not a number n which added to its sum of digits gives 400012554.

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 11 ways as a sum of consecutive naturals, for example, 863727 + ... + 864189.

It is an arithmetic number, because the mean of its divisors is an integer number (33513948).

Almost surely, 2^400012554 is an apocalyptic number.

400012554 is an abundant number, since it is smaller than the sum of its proper divisors (404322198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400012554 is an equidigital number, since it uses as much as digits as its factorization.

400012554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242 (or 779 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 400012554 is about 20000.3138475375. The cubic root of 400012554 is about 736.8140078693.

Adding to 400012554 its reverse (455210004), we get a palindrome (855222558).

The spelling of 400012554 in words is "four hundred million, twelve thousand, five hundred fifty-four".