400303155 has 64 divisors (see below), whose sum is σ = 788594688. Its totient is φ = 169361280.

The previous prime is 400303151. The next prime is 400303171. The reversal of 400303155 is 551303004.

It is not a de Polignac number, because 400303155 - 2² = 400303151 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (400303151) 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, 72192 + ... + 77538.

It is an arithmetic number, because the mean of its divisors is an integer number (12321792).

Almost surely, 2^400303155 is an apocalyptic number.

400303155 is a deficient number, since it is larger than the sum of its proper divisors (388291533).

400303155 is a wasteful number, since it uses less digits than its factorization.

400303155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5416.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 400303155 is about 20007.5774395602. The cubic root of 400303155 is about 736.9923914853.

Adding to 400303155 its reverse (551303004), we get a palindrome (951606159).

The spelling of 400303155 in words is "four hundred million, three hundred three thousand, one hundred fifty-five".