40694643 has 20 divisors (see below), whose sum is σ = 66318648. Its totient is φ = 24662880.

The previous prime is 40694623. The next prime is 40694663. The reversal of 40694643 is 34649604.

40694643 is a `hidden beast` number, since 4 + 0 + 6 + 9 + 4 + 643 = 666.

It is an interprime number because it is at equal distance from previous prime (40694623) and next prime (40694663).

It is not a de Polignac number, because 40694643 - 2⁹ = 40694131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40694598 and 40694607.

It is not an unprimeable number, because it can be changed into a prime (40694603) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21946 + ... + 23727.

Almost surely, 2^40694643 is an apocalyptic number.

40694643 is a deficient number, since it is larger than the sum of its proper divisors (25624005).

40694643 is a wasteful number, since it uses less digits than its factorization.

40694643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45696 (or 45687 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 40694643 is about 6379.2352989994. The cubic root of 40694643 is about 343.9635434369.

The spelling of 40694643 in words is "forty million, six hundred ninety-four thousand, six hundred forty-three".