3121432240 has 40 divisors (see below), whose sum is σ = 7272570240. Its totient is φ = 1245950976.

The previous prime is 3121432231. The next prime is 3121432273. The reversal of 3121432240 is 422341213.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×3121432240² = 19486678457822835200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2409 + ... + 79048.

It is an arithmetic number, because the mean of its divisors is an integer number (181814256).

Almost surely, 2^3121432240 is an apocalyptic number.

It is an amenable number.

3121432240 is an abundant number, since it is smaller than the sum of its proper divisors (4151138000).

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

3121432240 is a wasteful number, since it uses less digits than its factorization.

3121432240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81949 (or 81943 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 3121432240 is about 55869.7793086746. The cubic root of 3121432240 is about 1461.4522735794.

Adding to 3121432240 its reverse (422341213), we get a palindrome (3543773453).

The spelling of 3121432240 in words is "three billion, one hundred twenty-one million, four hundred thirty-two thousand, two hundred forty".