7978433421 has 32 divisors (see below), whose sum is σ = 12879406080. Its totient is φ = 4288709376.

The previous prime is 7978433413. The next prime is 7978433423. The reversal of 7978433421 is 1243348797.

It is not a de Polignac number, because 7978433421 - 2³ = 7978433413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7978433423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 876190 + ... + 885248.

It is an arithmetic number, because the mean of its divisors is an integer number (402481440).

Almost surely, 2^7978433421 is an apocalyptic number.

It is an amenable number.

7978433421 is a deficient number, since it is larger than the sum of its proper divisors (4900972659).

7978433421 is a wasteful number, since it uses less digits than its factorization.

7978433421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11553.

The product of its digits is 1016064, while the sum is 48.

The square root of 7978433421 is about 89322.0768959164. The cubic root of 7978433421 is about 1998.2011676695.

The spelling of 7978433421 in words is "seven billion, nine hundred seventy-eight million, four hundred thirty-three thousand, four hundred twenty-one".