7921449892 has 12 divisors (see below), whose sum is σ = 13863202780. Its totient is φ = 3960534816.

The previous prime is 7921449859. The next prime is 7921449901. The reversal of 7921449892 is 2989441297.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6635079936 + 1286369956 = 81456^2 + 35866^2 .

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, 91198 + ... + 155434.

Almost surely, 2^7921449892 is an apocalyptic number.

It is an amenable number.

7921449892 is a deficient number, since it is larger than the sum of its proper divisors (5941752888).

7921449892 is a wasteful number, since it uses less digits than its factorization.

7921449892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95070 (or 95068 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 55.

The square root of 7921449892 is about 89002.5274472585. The cubic root of 7921449892 is about 1993.4326160050.

The spelling of 7921449892 in words is "seven billion, nine hundred twenty-one million, four hundred forty-nine thousand, eight hundred ninety-two".