7899487 has 4 divisors (see below), whose sum is σ = 8083240. Its totient is φ = 7715736.

The previous prime is 7899481. The next prime is 7899499. The reversal of 7899487 is 7849987.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7849987 = 47 ⋅167021.

It is a 9-Lehmer number, since φ(7899487) divides (7899487-1)⁹.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7899487 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 (7899481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91812 + ... + 91897.

It is an arithmetic number, because the mean of its divisors is an integer number (2020810).

Almost surely, 2^7899487 is an apocalyptic number.

7899487 is a deficient number, since it is larger than the sum of its proper divisors (183753).

7899487 is a wasteful number, since it uses less digits than its factorization.

7899487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183752.

The product of its digits is 1016064, while the sum is 52.

The square root of 7899487 is about 2810.6026044249. The cubic root of 7899487 is about 199.1588590354.

The spelling of 7899487 in words is "seven million, eight hundred ninety-nine thousand, four hundred eighty-seven".