7949898921 has 16 divisors (see below), whose sum is σ = 11526724224. Its totient is φ = 4853355264.

The previous prime is 7949898911. The next prime is 7949898941. The reversal of 7949898921 is 1298989497.

It is not a de Polignac number, because 7949898921 - 2⁶ = 7949898857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7949898911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2104605 + ... + 2108378.

It is an arithmetic number, because the mean of its divisors is an integer number (720420264).

Almost surely, 2^7949898921 is an apocalyptic number.

It is an amenable number.

7949898921 is a deficient number, since it is larger than the sum of its proper divisors (3576825303).

7949898921 is a wasteful number, since it uses less digits than its factorization.

7949898921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4213040.

The product of its digits is 23514624, while the sum is 66.

The square root of 7949898921 is about 89162.2056759477. The cubic root of 7949898921 is about 1995.8161639443.

The spelling of 7949898921 in words is "seven billion, nine hundred forty-nine million, eight hundred ninety-eight thousand, nine hundred twenty-one".