7864013 has 4 divisors (see below), whose sum is σ = 8326620. Its totient is φ = 7401408.

The previous prime is 7863997. The next prime is 7864019. The reversal of 7864013 is 3104687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3104687 = 53 ⋅58579.

It can be written as a sum of positive squares in 2 ways, for example, as 6568969 + 1295044 = 2563^2 + 1138^2 .

It is a cyclic number.

It is not a de Polignac number, because 7864013 - 2⁴ = 7863997 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 (7864019) 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, 231278 + ... + 231311.

It is an arithmetic number, because the mean of its divisors is an integer number (2081655).

Almost surely, 2^7864013 is an apocalyptic number.

It is an amenable number.

7864013 is a deficient number, since it is larger than the sum of its proper divisors (462607).

7864013 is a wasteful number, since it uses less digits than its factorization.

7864013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462606.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 7864013 is about 2804.2847572955. The cubic root of 7864013 is about 198.8602926727.

The spelling of 7864013 in words is "seven million, eight hundred sixty-four thousand, thirteen".