7720942 has 4 divisors (see below), whose sum is σ = 11581416. Its totient is φ = 3860470.

The previous prime is 7720903. The next prime is 7720943. The reversal of 7720942 is 2490277.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2490277 = 197 ⋅12641.

It is a super-2 number, since 2×7720942² = 119225890734728, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7720943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1930234 + ... + 1930237.

It is an arithmetic number, because the mean of its divisors is an integer number (2895354).

Almost surely, 2^7720942 is an apocalyptic number.

7720942 is a deficient number, since it is larger than the sum of its proper divisors (3860474).

7720942 is a wasteful number, since it uses less digits than its factorization.

7720942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3860473.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 7720942 is about 2778.6583093284. The cubic root of 7720942 is about 197.6469408006.

The spelling of 7720942 in words is "seven million, seven hundred twenty thousand, nine hundred forty-two".