3213431440 has 20 divisors (see below), whose sum is σ = 7471228284. Its totient is φ = 1285372544.

The previous prime is 3213431437. The next prime is 3213431461. The reversal of 3213431440 is 441343123.

It can be written as a sum of positive squares in 2 ways, for example, as 1575772416 + 1637659024 = 39696^2 + 40468^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×3213431440² = 20652283239160947200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20083867 + ... + 20084026.

Almost surely, 2^3213431440 is an apocalyptic number.

It is an amenable number.

3213431440 is an abundant number, since it is smaller than the sum of its proper divisors (4257796844).

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

3213431440 is a wasteful number, since it uses less digits than its factorization.

3213431440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40167906 (or 40167900 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 3213431440 is about 56687.1364596943. The cubic root of 3213431440 is about 1475.6714652291.

Adding to 3213431440 its reverse (441343123), we get a palindrome (3654774563).

The spelling of 3213431440 in words is "three billion, two hundred thirteen million, four hundred thirty-one thousand, four hundred forty".