1245040645 has 32 divisors (see below), whose sum is σ = 1705898880. Its totient is φ = 866396160.

The previous prime is 1245040633. The next prime is 1245040661. The reversal of 1245040645 is 5460405421.

It is a happy number.

It is not a de Polignac number, because 1245040645 - 2¹⁵ = 1245007877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56814 + ... + 75616.

It is an arithmetic number, because the mean of its divisors is an integer number (53309340).

Almost surely, 2^1245040645 is an apocalyptic number.

It is an amenable number.

1245040645 is a deficient number, since it is larger than the sum of its proper divisors (460858235).

1245040645 is a wasteful number, since it uses less digits than its factorization.

1245040645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18885.

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 1245040645 is about 35285.1334842310. The cubic root of 1245040645 is about 1075.7908426139.

The spelling of 1245040645 in words is "one billion, two hundred forty-five million, forty thousand, six hundred forty-five".