7974020391 has 16 divisors (see below), whose sum is σ = 11262037248. Its totient is φ = 5001264000.

The previous prime is 7974020389. The next prime is 7974020399. The reversal of 7974020391 is 1930204797.

It is not a de Polignac number, because 7974020391 - 2¹ = 7974020389 is a prime.

It is a super-3 number, since 3×7974020391³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7974020399) 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, 99456 + ... + 160746.

It is an arithmetic number, because the mean of its divisors is an integer number (703877328).

Almost surely, 2^7974020391 is an apocalyptic number.

7974020391 is a deficient number, since it is larger than the sum of its proper divisors (3288016857).

7974020391 is a wasteful number, since it uses less digits than its factorization.

7974020391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63862.

The product of its (nonzero) digits is 95256, while the sum is 42.

The square root of 7974020391 is about 89297.3705715907. The cubic root of 7974020391 is about 1997.8326848041.

The spelling of 7974020391 in words is "seven billion, nine hundred seventy-four million, twenty thousand, three hundred ninety-one".