400541555 has 16 divisors (see below), whose sum is σ = 489403200. Its totient is φ = 314616960.

The previous prime is 400541521. The next prime is 400541621. The reversal of 400541555 is 555145004.

It is a happy number.

It is not a de Polignac number, because 400541555 - 2¹⁰ = 400540531 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279581 + ... + 281009.

It is an arithmetic number, because the mean of its divisors is an integer number (30587700).

Almost surely, 2^400541555 is an apocalyptic number.

400541555 is a deficient number, since it is larger than the sum of its proper divisors (88861645).

400541555 is a wasteful number, since it uses less digits than its factorization.

400541555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2414.

The product of its (nonzero) digits is 10000, while the sum is 29.

The square root of 400541555 is about 20013.5342955711. The cubic root of 400541555 is about 737.1386673901.

Adding to 400541555 its reverse (555145004), we get a palindrome (955686559).

The spelling of 400541555 in words is "four hundred million, five hundred forty-one thousand, five hundred fifty-five".