400155105 has 32 divisors (see below), whose sum is σ = 770227200. Its totient is φ = 173299392.

The previous prime is 400155101. The next prime is 400155109. The reversal of 400155105 is 501551004.

It is an interprime number because it is at equal distance from previous prime (400155101) and next prime (400155109).

It is not a de Polignac number, because 400155105 - 2² = 400155101 is a prime.

It is a super-2 number, since 2×400155105² = 320248216115122050, which contains 22 as substring.

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 (400155101) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 98295 + ... + 102284.

It is an arithmetic number, because the mean of its divisors is an integer number (24069600).

Almost surely, 2^400155105 is an apocalyptic number.

It is an amenable number.

400155105 is a deficient number, since it is larger than the sum of its proper divisors (370072095).

400155105 is a wasteful number, since it uses less digits than its factorization.

400155105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200613.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 400155105 is about 20003.8772491735. The cubic root of 400155105 is about 736.9015227054.

The spelling of 400155105 in words is "four hundred million, one hundred fifty-five thousand, one hundred five".