7720379 has 4 divisors (see below), whose sum is σ = 7727376. Its totient is φ = 7713384.

The previous prime is 7720373. The next prime is 7720381. The reversal of 7720379 is 9730277.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9730277 = 257 ⋅37861.

It is a cyclic number.

It is not a de Polignac number, because 7720379 - 2⁸ = 7720123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7720373) 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, 1439 + ... + 4184.

It is an arithmetic number, because the mean of its divisors is an integer number (1931844).

Almost surely, 2^7720379 is an apocalyptic number.

7720379 is a deficient number, since it is larger than the sum of its proper divisors (6997).

7720379 is a wasteful number, since it uses less digits than its factorization.

7720379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6996.

The product of its (nonzero) digits is 18522, while the sum is 35.

The square root of 7720379 is about 2778.5569995953. The cubic root of 7720379 is about 197.6421366401.

The spelling of 7720379 in words is "seven million, seven hundred twenty thousand, three hundred seventy-nine".