840472245 has 24 divisors (see below), whose sum is σ = 1462642272. Its totient is φ = 446460000.

The previous prime is 840472223. The next prime is 840472247. The reversal of 840472245 is 542274048.

840472245 is a `hidden beast` number, since 8 + 404 + 7 + 2 + 245 = 666.

It is not a de Polignac number, because 840472245 - 2⁶ = 840472181 is a prime.

It is a Smith number, since the sum of its digits (36) 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 (840472247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25911 + ... + 48500.

It is an arithmetic number, because the mean of its divisors is an integer number (60943428).

Almost surely, 2^840472245 is an apocalyptic number.

It is an amenable number.

840472245 is a deficient number, since it is larger than the sum of its proper divisors (622170027).

840472245 is a wasteful number, since it uses less digits than its factorization.

840472245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74673 (or 74670 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 36.

The square root of 840472245 is about 28990.8993478988. The cubic root of 840472245 is about 943.7155809853.

The spelling of 840472245 in words is "eight hundred forty million, four hundred seventy-two thousand, two hundred forty-five".