400105512 has 48 divisors (see below), whose sum is σ = 1085116500. Its totient is φ = 133184256.

The previous prime is 400105471. The next prime is 400105513. The reversal of 400105512 is 215501004.

It can be written as a sum of positive squares in 2 ways, for example, as 394657956 + 5447556 = 19866^2 + 2334^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (400105513) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54814 + ... + 61682.

Almost surely, 2^400105512 is an apocalyptic number.

It is an amenable number.

400105512 is an abundant number, since it is smaller than the sum of its proper divisors (685010988).

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

400105512 is a wasteful number, since it uses less digits than its factorization.

400105512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7690 (or 7683 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 400105512 is about 20002.6376260732. The cubic root of 400105512 is about 736.8710789545.

Adding to 400105512 its reverse (215501004), we get a palindrome (615606516).

The spelling of 400105512 in words is "four hundred million, one hundred five thousand, five hundred twelve".