7920749 has 4 divisors (see below), whose sum is σ = 8113980. Its totient is φ = 7727520.

The previous prime is 7920727. The next prime is 7920761. The reversal of 7920749 is 9470297.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 592900 + 7327849 = 770^2 + 2707^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7920749 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 (7920709) 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, 96554 + ... + 96635.

It is an arithmetic number, because the mean of its divisors is an integer number (2028495).

Almost surely, 2^7920749 is an apocalyptic number.

It is an amenable number.

7920749 is a deficient number, since it is larger than the sum of its proper divisors (193231).

7920749 is a wasteful number, since it uses less digits than its factorization.

7920749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193230.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 7920749 is about 2814.3825255285. The cubic root of 7920749 is about 199.3373821121.

The spelling of 7920749 in words is "seven million, nine hundred twenty thousand, seven hundred forty-nine".