7951993 has 4 divisors (see below), whose sum is σ = 9088000. Its totient is φ = 6815988.

The previous prime is 7951973. The next prime is 7952011. The reversal of 7951993 is 3991597.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3991597 = 37 ⋅107881.

It is a cyclic number.

It is not a de Polignac number, because 7951993 - 2¹³ = 7943801 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7951913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 567993 + ... + 568006.

It is an arithmetic number, because the mean of its divisors is an integer number (2272000).

Almost surely, 2^7951993 is an apocalyptic number.

It is an amenable number.

7951993 is a deficient number, since it is larger than the sum of its proper divisors (1136007).

7951993 is a wasteful number, since it uses less digits than its factorization.

7951993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136006.

The product of its digits is 76545, while the sum is 43.

The square root of 7951993 is about 2819.9278359561. The cubic root of 7951993 is about 199.5991387548.

The spelling of 7951993 in words is "seven million, nine hundred fifty-one thousand, nine hundred ninety-three".