3121739748 has 72 divisors (see below), whose sum is σ = 8392194720. Its totient is φ = 975628800.

The previous prime is 3121739743. The next prime is 3121739821. The reversal of 3121739748 is 8479371213.

3121739748 is a `hidden beast` number, since 3 + 1 + 217 + 397 + 48 = 666.

It is not an unprimeable number, because it can be changed into a prime (3121739743) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42823 + ... + 89873.

It is an arithmetic number, because the mean of its divisors is an integer number (116558260).

Almost surely, 2^3121739748 is an apocalyptic number.

3121739748 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3121739748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4196097360).

3121739748 is an abundant number, since it is smaller than the sum of its proper divisors (5270454972).

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

3121739748 is a wasteful number, since it uses less digits than its factorization.

3121739748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47177 (or 47172 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 3121739748 is about 55872.5312474744. The cubic root of 3121739748 is about 1461.5002636765.

The spelling of 3121739748 in words is "three billion, one hundred twenty-one million, seven hundred thirty-nine thousand, seven hundred forty-eight".