840601987 has 4 divisors (see below), whose sum is σ = 840782376. Its totient is φ = 840421600.

The previous prime is 840601961. The next prime is 840601991. The reversal of 840601987 is 789106048.

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 840601987 - 2²³ = 832213379 is a prime.

It is a super-2 number, since 2×840601987² = 1413223401096696338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840601387) 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, 83014 + ... + 92587.

It is an arithmetic number, because the mean of its divisors is an integer number (210195594).

Almost surely, 2^840601987 is an apocalyptic number.

840601987 is a deficient number, since it is larger than the sum of its proper divisors (180389).

840601987 is a wasteful number, since it uses less digits than its factorization.

840601987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180388.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 840601987 is about 28993.1368947894. The cubic root of 840601987 is about 943.7641383084.

The spelling of 840601987 in words is "eight hundred forty million, six hundred one thousand, nine hundred eighty-seven".