7857045 has 24 divisors (see below), whose sum is σ = 15565056. Its totient is φ = 3591648.

The previous prime is 7857019. The next prime is 7857067. The reversal of 7857045 is 5407587.

It is not a de Polignac number, because 7857045 - 2¹⁵ = 7824277 is a prime.

It is a super-2 number, since 2×7857045² = 123466312264050, which contains 22 as substring.

7857045 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12157 + ... + 12786.

It is an arithmetic number, because the mean of its divisors is an integer number (648544).

Almost surely, 2^7857045 is an apocalyptic number.

It is an amenable number.

7857045 is a deficient number, since it is larger than the sum of its proper divisors (7708011).

7857045 is a wasteful number, since it uses less digits than its factorization.

7857045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24961 (or 24958 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The square root of 7857045 is about 2803.0420974363. The cubic root of 7857045 is about 198.8015411600.

The spelling of 7857045 in words is "seven million, eight hundred fifty-seven thousand, forty-five".