7645139 has 4 divisors (see below), whose sum is σ = 7700280. Its totient is φ = 7590000.

The previous prime is 7645117. The next prime is 7645159. The reversal of 7645139 is 9315467.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7645139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7645099 and 7645108.

It is not an unprimeable number, because it can be changed into a prime (7645159) 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, 27362 + ... + 27639.

It is an arithmetic number, because the mean of its divisors is an integer number (1925070).

Almost surely, 2^7645139 is an apocalyptic number.

7645139 is a deficient number, since it is larger than the sum of its proper divisors (55141).

7645139 is a wasteful number, since it uses less digits than its factorization.

7645139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55140.

The product of its digits is 22680, while the sum is 35.

The square root of 7645139 is about 2764.9844484192. The cubic root of 7645139 is about 196.9979901364.

The spelling of 7645139 in words is "seven million, six hundred forty-five thousand, one hundred thirty-nine".