3129646940 has 144 divisors (see below), whose sum is σ = 8194368000. Its totient is φ = 980792064.

The previous prime is 3129646889. The next prime is 3129646987. The reversal of 3129646940 is 496469213.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 3129646891 and 3129646900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2236361 + ... + 2237759.

Almost surely, 2^3129646940 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 3129646940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4097184000).

3129646940 is an abundant number, since it is smaller than the sum of its proper divisors (5064721060).

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

3129646940 is a wasteful number, since it uses less digits than its factorization.

3129646940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1492 (or 1461 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 3129646940 is about 55943.2474924365. The cubic root of 3129646940 is about 1462.7331893979.

The spelling of 3129646940 in words is "three billion, one hundred twenty-nine million, six hundred forty-six thousand, nine hundred forty".