840472791 has 4 divisors (see below), whose sum is σ = 1120630392. Its totient is φ = 560315192.

The previous prime is 840472777. The next prime is 840472819. The reversal of 840472791 is 197274048.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 840472791 - 2⁷ = 840472663 is a prime.

It is a super-2 number, since 2×840472791² = 1412789024822659362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840472891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140078796 + ... + 140078801.

It is an arithmetic number, because the mean of its divisors is an integer number (280157598).

Almost surely, 2^840472791 is an apocalyptic number.

840472791 is a deficient number, since it is larger than the sum of its proper divisors (280157601).

840472791 is a wasteful number, since it uses less digits than its factorization.

840472791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280157600.

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 840472791 is about 28990.9087646455. The cubic root of 840472791 is about 943.7157853421.

The spelling of 840472791 in words is "eight hundred forty million, four hundred seventy-two thousand, seven hundred ninety-one".