400003531440 has 80 divisors (see below), whose sum is σ = 1243523989728. Its totient is φ = 106365411328.

The previous prime is 400003531307. The next prime is 400003531453. The reversal of 400003531440 is 44135300004.

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

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 400003531440.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2276019 + ... + 2445458.

Almost surely, 2^400003531440 is an apocalyptic number.

400003531440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400003531440 is an abundant number, since it is smaller than the sum of its proper divisors (843520458288).

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

400003531440 is a wasteful number, since it uses less digits than its factorization.

400003531440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4721846 (or 4721840 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

Adding to 400003531440 its reverse (44135300004), we get a palindrome (444138831444).

The spelling of 400003531440 in words is "four hundred billion, three million, five hundred thirty-one thousand, four hundred forty".