7921001438 has 32 divisors (see below), whose sum is σ = 13675184640. Its totient is φ = 3370721760.

The previous prime is 7921001383. The next prime is 7921001479. The reversal of 7921001438 is 8341001297.

It is a junction number, because it is equal to n+sod(n) for n = 7921001398 and 7921001407.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1167845 + ... + 1174607.

It is an arithmetic number, because the mean of its divisors is an integer number (427349520).

Almost surely, 2^7921001438 is an apocalyptic number.

7921001438 is a deficient number, since it is larger than the sum of its proper divisors (5754183202).

7921001438 is a wasteful number, since it uses less digits than its factorization.

7921001438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7352.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 7921001438 is about 89000.0080786513. The cubic root of 7921001438 is about 1993.3949974834.

The spelling of 7921001438 in words is "seven billion, nine hundred twenty-one million, one thousand, four hundred thirty-eight".