7998749 has 4 divisors (see below), whose sum is σ = 8725920. Its totient is φ = 7271580.

The previous prime is 7998743. The next prime is 7998763. The reversal of 7998749 is 9478997.

7998749 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7998749 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7998749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7998743) 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, 363569 + ... + 363590.

It is an arithmetic number, because the mean of its divisors is an integer number (2181480).

Almost surely, 2^7998749 is an apocalyptic number.

It is an amenable number.

7998749 is a deficient number, since it is larger than the sum of its proper divisors (727171).

7998749 is a wasteful number, since it uses less digits than its factorization.

7998749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727170.

The product of its digits is 1143072, while the sum is 53.

The square root of 7998749 is about 2828.2059684542. The cubic root of 7998749 is about 199.9895744565.

The spelling of 7998749 in words is "seven million, nine hundred ninety-eight thousand, seven hundred forty-nine".