400515500 has 192 divisors, whose sum is σ = 1112057856. Its totient is φ = 122400000.

The previous prime is 400515499. The next prime is 400515509. The reversal of 400515500 is 5515004.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (400515509) 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, 3888449 + ... + 3888551.

It is an arithmetic number, because the mean of its divisors is an integer number (5791968).

Almost surely, 2^400515500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400515500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (556028928).

400515500 is an abundant number, since it is smaller than the sum of its proper divisors (711542356).

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

400515500 is a wasteful number, since it uses less digits than its factorization.

400515500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 400515500 is about 20012.8833504820. The cubic root of 400515500 is about 737.1226835600.

The spelling of 400515500 in words is "four hundred million, five hundred fifteen thousand, five hundred".