440431155 has 64 divisors (see below), whose sum is σ = 848517120. Its totient is φ = 215889408.

The previous prime is 440431129. The next prime is 440431157. The reversal of 440431155 is 551134044.

It is a happy number.

It is not a de Polignac number, because 440431155 - 2⁷ = 440431027 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (440431157) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 96454 + ... + 100916.

It is an arithmetic number, because the mean of its divisors is an integer number (13258080).

Almost surely, 2^440431155 is an apocalyptic number.

440431155 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

440431155 is a deficient number, since it is larger than the sum of its proper divisors (408085965).

440431155 is a wasteful number, since it uses less digits than its factorization.

440431155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4537 (or 4531 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 440431155 is about 20986.4517010380. The cubic root of 440431155 is about 760.8388446815.

Adding to 440431155 its reverse (551134044), we get a palindrome (991565199).

The spelling of 440431155 in words is "four hundred forty million, four hundred thirty-one thousand, one hundred fifty-five".