7945645 has 4 divisors (see below), whose sum is σ = 9534780. Its totient is φ = 6356512.

The previous prime is 7945633. The next prime is 7945661. The reversal of 7945645 is 5465497.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5076009 + 2869636 = 2253^2 + 1694^2 .

It is a cyclic number.

It is not a de Polignac number, because 7945645 - 2¹¹ = 7943597 is a prime.

It is a super-3 number, since 3×7945645³ (a number of 22 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 7945598 and 7945607.

It is a congruent number.

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, 794560 + ... + 794569.

It is an arithmetic number, because the mean of its divisors is an integer number (2383695).

Almost surely, 2^7945645 is an apocalyptic number.

It is an amenable number.

7945645 is a deficient number, since it is larger than the sum of its proper divisors (1589135).

7945645 is a wasteful number, since it uses less digits than its factorization.

7945645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1589134.

The product of its digits is 151200, while the sum is 40.

The square root of 7945645 is about 2818.8020505172. The cubic root of 7945645 is about 199.5460119205.

It can be divided in two parts, 79 and 45645, that multiplied together give a triangular number (3605955 = T₂₆₈₅).

The spelling of 7945645 in words is "seven million, nine hundred forty-five thousand, six hundred forty-five".