7921693 has 4 divisors (see below), whose sum is σ = 8531068. Its totient is φ = 7312320.

The previous prime is 7921691. The next prime is 7921703. The reversal of 7921693 is 3961297.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5189284 + 2732409 = 2278^2 + 1653^2 .

It is a cyclic number.

It is not a de Polignac number, because 7921693 - 2¹ = 7921691 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7921691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304668 + ... + 304693.

It is an arithmetic number, because the mean of its divisors is an integer number (2132767).

Almost surely, 2^7921693 is an apocalyptic number.

It is an amenable number.

7921693 is a deficient number, since it is larger than the sum of its proper divisors (609375).

7921693 is a wasteful number, since it uses less digits than its factorization.

7921693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609374.

The product of its digits is 20412, while the sum is 37.

The square root of 7921693 is about 2814.5502304986. The cubic root of 7921693 is about 199.3453008503.

Adding to 7921693 its product of digits (20412), we get a triangular number (7942105 = T₃₉₈₅).

It can be divided in two parts, 792 and 1693, that added together give a triangular number (2485 = T₇₀).

The spelling of 7921693 in words is "seven million, nine hundred twenty-one thousand, six hundred ninety-three".