400155515120 has 80 divisors (see below), whose sum is σ = 934880580480. Its totient is φ = 159286424832.

The previous prime is 400155515119. The next prime is 400155515147. The reversal of 400155515120 is 21515551004.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×400155515120² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 15779411 + ... + 15804749.

It is an arithmetic number, because the mean of its divisors is an integer number (11686007256).

Almost surely, 2^400155515120 is an apocalyptic number.

400155515120 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400155515120 is an abundant number, since it is smaller than the sum of its proper divisors (534725065360).

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

400155515120 is a wasteful number, since it uses less digits than its factorization.

400155515120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26302 (or 26296 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 29.

The spelling of 400155515120 in words is "four hundred billion, one hundred fifty-five million, five hundred fifteen thousand, one hundred twenty".