7809945 has 48 divisors (see below), whose sum is σ = 14836416. Its totient is φ = 3484800.

The previous prime is 7809941. The next prime is 7809947. The reversal of 7809945 is 5499087.

It is not a de Polignac number, because 7809945 - 2² = 7809941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7809897 and 7809906.

It is not an unprimeable number, because it can be changed into a prime (7809941) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23430 + ... + 23760.

It is an arithmetic number, because the mean of its divisors is an integer number (309092).

Almost surely, 2^7809945 is an apocalyptic number.

It is an amenable number.

7809945 is a deficient number, since it is larger than the sum of its proper divisors (7026471).

7809945 is a wasteful number, since it uses less digits than its factorization.

7809945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 363 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 7809945 is about 2794.6278822054. The cubic root of 7809945 is about 198.4034981525.

The spelling of 7809945 in words is "seven million, eight hundred nine thousand, nine hundred forty-five".