342987 has 4 divisors (see below), whose sum is σ = 457320. Its totient is φ = 228656.

The previous prime is 342971. The next prime is 342989. The reversal of 342987 is 789243.

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 342987 - 2⁴ = 342971 is a prime.

It is a D-number.

342987 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 342987.

It is not an unprimeable number, because it can be changed into a prime (342989) 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, 57162 + ... + 57167.

It is an arithmetic number, because the mean of its divisors is an integer number (114330).

342987 is a Friedman number, since it can be written as (7*(8+2))^3-9-4, using all its digits and the basic arithmetic operations.

2³⁴²⁹⁸⁷ is an apocalyptic number.

342987 is a deficient number, since it is larger than the sum of its proper divisors (114333).

342987 is a wasteful number, since it uses less digits than its factorization.

342987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114332.

The product of its digits is 12096, while the sum is 33.

The square root of 342987 is about 585.6509199173. The cubic root of 342987 is about 69.9991156351. Note that the first 3 decimals are identical.

Subtracting from 342987 its product of digits (12096), we obtain a triangular number (330891 = T₈₁₃).

The spelling of 342987 in words is "three hundred forty-two thousand, nine hundred eighty-seven".