7138999 has 4 divisors (see below), whose sum is σ = 8158864. Its totient is φ = 6119136.

The previous prime is 7138987. The next prime is 7139009. The reversal of 7138999 is 9998317.

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

It is a cyclic number.

It is not a de Polignac number, because 7138999 - 2¹³ = 7130807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7138919) 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, 509922 + ... + 509935.

It is an arithmetic number, because the mean of its divisors is an integer number (2039716).

Almost surely, 2^7138999 is an apocalyptic number.

7138999 is a deficient number, since it is larger than the sum of its proper divisors (1019865).

7138999 is a wasteful number, since it uses less digits than its factorization.

7138999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019864.

The product of its digits is 122472, while the sum is 46.

The square root of 7138999 is about 2671.8905291946. The cubic root of 7138999 is about 192.5509979011.

The spelling of 7138999 in words is "seven million, one hundred thirty-eight thousand, nine hundred ninety-nine".