7860391642321 has 3 divisors (see below), whose sum is σ = 7860394445961. Its totient is φ = 7860388838682.

The previous prime is 7860391642307. The next prime is 7860391642381. The reversal of 7860391642321 is 1232461930687.

It is a happy number.

The square root of 7860391642321 is 2803639.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 7860391642321 - 2²³ = 7860383253713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7860391642381) 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 2 ways as a sum of consecutive naturals, for example, 1401820 + ... + 4205458.

It is an arithmetic number, because the mean of its divisors is an integer number (2620131481987).

Almost surely, 2^{7860391642321} is an apocalyptic number.

7860391642321 is the 2803639-th square number.

7860391642321 is the 1401820-th centered octagonal number.

It is an amenable number.

7860391642321 is a deficient number, since it is larger than the sum of its proper divisors (2803640).

7860391642321 is an frugal number, since it uses more digits than its factorization.

7860391642321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5607278 (or 2803639 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 52.

The spelling of 7860391642321 in words is "seven trillion, eight hundred sixty billion, three hundred ninety-one million, six hundred forty-two thousand, three hundred twenty-one".