7138123640402 has 8 divisors (see below), whose sum is σ = 11337019899516. Its totient is φ = 3359117007232.

The previous prime is 7138123640393. The next prime is 7138123640441. The reversal of 7138123640402 is 2040463218317.

It can be written as a sum of positive squares in 2 ways, for example, as 6627540508801 + 510583131601 = 2574401^2 + 714551^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 7138123640402.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104972406443 + ... + 104972406510.

Almost surely, 2^{7138123640402} is an apocalyptic number.

7138123640402 is a deficient number, since it is larger than the sum of its proper divisors (4198896259114).

7138123640402 is a wasteful number, since it uses less digits than its factorization.

7138123640402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209944812972.

The product of its (nonzero) digits is 193536, while the sum is 41.

Adding to 7138123640402 its reverse (2040463218317), we get a palindrome (9178586858719).

The spelling of 7138123640402 in words is "seven trillion, one hundred thirty-eight billion, one hundred twenty-three million, six hundred forty thousand, four hundred two".