7897915 has 4 divisors (see below), whose sum is σ = 9477504. Its totient is φ = 6318328.

The previous prime is 7897907. The next prime is 7897951. The reversal of 7897915 is 5197987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5197987 = 31 ⋅167677.

It is a cyclic number.

It is not a de Polignac number, because 7897915 - 2³ = 7897907 is a prime.

It is a super-2 number, since 2×7897915² = 124754122694450, which contains 22 as substring.

It is a Duffinian number.

7897915 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 789787 + ... + 789796.

It is an arithmetic number, because the mean of its divisors is an integer number (2369376).

Almost surely, 2^7897915 is an apocalyptic number.

7897915 is a deficient number, since it is larger than the sum of its proper divisors (1579589).

7897915 is a wasteful number, since it uses less digits than its factorization.

7897915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1579588.

The product of its digits is 158760, while the sum is 46.

The square root of 7897915 is about 2810.3229351802. The cubic root of 7897915 is about 199.1456472705.

The spelling of 7897915 in words is "seven million, eight hundred ninety-seven thousand, nine hundred fifteen".