7138579621 has 8 divisors (see below), whose sum is σ = 7494655680. Its totient is φ = 6786312192.

The previous prime is 7138579583. The next prime is 7138579639. The reversal of 7138579621 is 1269758317.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7138579621 - 2¹⁷ = 7138448549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7138579691) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 948316 + ... + 955813.

It is an arithmetic number, because the mean of its divisors is an integer number (936831960).

Almost surely, 2^7138579621 is an apocalyptic number.

It is an amenable number.

7138579621 is a deficient number, since it is larger than the sum of its proper divisors (356076059).

7138579621 is a wasteful number, since it uses less digits than its factorization.

7138579621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1904315.

The product of its digits is 635040, while the sum is 49.

The square root of 7138579621 is about 84490.1155224681. The cubic root of 7138579621 is about 1925.4722737122.

The spelling of 7138579621 in words is "seven billion, one hundred thirty-eight million, five hundred seventy-nine thousand, six hundred twenty-one".