7790945 has 4 divisors (see below), whose sum is σ = 9349140. Its totient is φ = 6232752.

The previous prime is 7790929. The next prime is 7790953. The reversal of 7790945 is 5490977.

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: 5490977 = 523 ⋅10499.

It can be written as a sum of positive squares in 2 ways, for example, as 5564881 + 2226064 = 2359^2 + 1492^2 .

It is a cyclic number.

It is not a de Polignac number, because 7790945 - 2⁴ = 7790929 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 779090 + ... + 779099.

It is an arithmetic number, because the mean of its divisors is an integer number (2337285).

Almost surely, 2^7790945 is an apocalyptic number.

It is an amenable number.

7790945 is a deficient number, since it is larger than the sum of its proper divisors (1558195).

7790945 is a wasteful number, since it uses less digits than its factorization.

7790945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558194.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 7790945 is about 2791.2264329502. The cubic root of 7790945 is about 198.2424757831.

Subtracting from 7790945 its reverse (5490977), we obtain a cube (2299968 = 132³).

The spelling of 7790945 in words is "seven million, seven hundred ninety thousand, nine hundred forty-five".