3121921830 has 32 divisors (see below), whose sum is σ = 7598147328. Its totient is φ = 820786400.

The previous prime is 3121921807. The next prime is 3121921841. The reversal of 3121921830 is 381291213.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 730716 + ... + 734975.

It is an arithmetic number, because the mean of its divisors is an integer number (237442104).

Almost surely, 2^3121921830 is an apocalyptic number.

3121921830 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

3121921830 is an abundant number, since it is smaller than the sum of its proper divisors (4476225498).

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

3121921830 is a wasteful number, since it uses less digits than its factorization.

3121921830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1465772.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 3121921830 is about 55874.1606648368. The cubic root of 3121921830 is about 1461.5286781439.

The spelling of 3121921830 in words is "three billion, one hundred twenty-one million, nine hundred twenty-one thousand, eight hundred thirty".