7800997421 has 12 divisors (see below), whose sum is σ = 9110797920. Its totient is φ = 6659919000.

The previous prime is 7800997403. The next prime is 7800997433. The reversal of 7800997421 is 1247990087.

It is not a de Polignac number, because 7800997421 - 2¹⁴ = 7800981037 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7800997021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 304841 + ... + 329438.

It is an arithmetic number, because the mean of its divisors is an integer number (759233160).

Almost surely, 2^7800997421 is an apocalyptic number.

It is an amenable number.

7800997421 is a deficient number, since it is larger than the sum of its proper divisors (1309800499).

7800997421 is a wasteful number, since it uses less digits than its factorization.

7800997421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634544 (or 634537 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 7800997421 is about 88323.2552672285. The cubic root of 7800997421 is about 1983.2770123184.

The spelling of 7800997421 in words is "seven billion, eight hundred million, nine hundred ninety-seven thousand, four hundred twenty-one".