7720423 has 4 divisors (see below), whose sum is σ = 7908768. Its totient is φ = 7532080.

The previous prime is 7720399. The next prime is 7720429. The reversal of 7720423 is 3240277.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7720423 is a prime.

It is a d-powerful number, because it can be written as 7³ + 7⁷ + 2⁵ + 0 + 4⁷ + 2²¹ + 3¹⁴ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7720429) 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, 94111 + ... + 94192.

It is an arithmetic number, because the mean of its divisors is an integer number (1977192).

Almost surely, 2^7720423 is an apocalyptic number.

7720423 is a deficient number, since it is larger than the sum of its proper divisors (188345).

7720423 is a wasteful number, since it uses less digits than its factorization.

7720423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188344.

The product of its (nonzero) digits is 2352, while the sum is 25.

The square root of 7720423 is about 2778.5649173629. The cubic root of 7720423 is about 197.6425121069.

The spelling of 7720423 in words is "seven million, seven hundred twenty thousand, four hundred twenty-three".