7998457 has 4 divisors (see below), whose sum is σ = 8346240. Its totient is φ = 7650676.

The previous prime is 7998451. The next prime is 7998481. The reversal of 7998457 is 7548997.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7548997 = 1621 ⋅4657.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7998457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7998457.

It is not an unprimeable number, because it can be changed into a prime (7998451) 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, 173857 + ... + 173902.

It is an arithmetic number, because the mean of its divisors is an integer number (2086560).

Almost surely, 2^7998457 is an apocalyptic number.

It is an amenable number.

7998457 is a deficient number, since it is larger than the sum of its proper divisors (347783).

7998457 is a wasteful number, since it uses less digits than its factorization.

7998457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347782.

The product of its digits is 635040, while the sum is 49.

The square root of 7998457 is about 2828.1543451516. The cubic root of 7998457 is about 199.9871408399.

The spelling of 7998457 in words is "seven million, nine hundred ninety-eight thousand, four hundred fifty-seven".