4118972391 has 20 divisors (see below), whose sum is σ = 6179929800. Its totient is φ = 2733978096.

The previous prime is 4118972353. The next prime is 4118972461. The reversal of 4118972391 is 1932798114.

4118972391 is a `hidden beast` number, since 411 + 89 + 72 + 3 + 91 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-4118972391 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4118972321) 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, 92481 + ... + 129578.

It is an arithmetic number, because the mean of its divisors is an integer number (308996490).

Almost surely, 2^4118972391 is an apocalyptic number.

4118972391 is a deficient number, since it is larger than the sum of its proper divisors (2060957409).

4118972391 is a wasteful number, since it uses less digits than its factorization.

4118972391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222300 (or 222291 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 4118972391 is about 64179.2208662586. The cubic root of 4118972391 is about 1602.9856220675.

The spelling of 4118972391 in words is "four billion, one hundred eighteen million, nine hundred seventy-two thousand, three hundred ninety-one".