840018387 has 12 divisors (see below), whose sum is σ = 1212808344. Its totient is φ = 516934080.

The previous prime is 840018337. The next prime is 840018407. The reversal of 840018387 is 783810048.

It is not a de Polignac number, because 840018387 - 2¹⁹ = 839494099 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (840018337) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 827914 + ... + 828927.

It is an arithmetic number, because the mean of its divisors is an integer number (101067362).

Almost surely, 2^840018387 is an apocalyptic number.

840018387 is a deficient number, since it is larger than the sum of its proper divisors (372789957).

840018387 is a wasteful number, since it uses less digits than its factorization.

840018387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656870 (or 1656857 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 840018387 is about 28983.0706965290. The cubic root of 840018387 is about 943.5456804765.

The spelling of 840018387 in words is "eight hundred forty million, eighteen thousand, three hundred eighty-seven".