840497247 has 6 divisors (see below), whose sum is σ = 1214051592. Its totient is φ = 560331492.

The previous prime is 840497239. The next prime is 840497249. The reversal of 840497247 is 742794048.

It is not a de Polignac number, because 840497247 - 2³ = 840497239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840497249) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46694283 + ... + 46694300.

It is an arithmetic number, because the mean of its divisors is an integer number (202341932).

Almost surely, 2^840497247 is an apocalyptic number.

840497247 is a deficient number, since it is larger than the sum of its proper divisors (373554345).

840497247 is a wasteful number, since it uses less digits than its factorization.

840497247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93388589 (or 93388586 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 45.

The square root of 840497247 is about 28991.3305489762. The cubic root of 840497247 is about 943.7249386383.

The spelling of 840497247 in words is "eight hundred forty million, four hundred ninety-seven thousand, two hundred forty-seven".