349987 has 4 divisors (see below), whose sum is σ = 381816. Its totient is φ = 318160.

The previous prime is 349981. The next prime is 350003. The reversal of 349987 is 789943.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-349987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (349981) 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, 15898 + ... + 15919.

It is an arithmetic number, because the mean of its divisors is an integer number (95454).

2³⁴⁹⁹⁸⁷ is an apocalyptic number.

349987 is a deficient number, since it is larger than the sum of its proper divisors (31829).

349987 is a wasteful number, since it uses less digits than its factorization.

349987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31828.

The product of its digits is 54432, while the sum is 40.

The square root of 349987 is about 591.5969912026. The cubic root of 349987 is about 70.4721147871.

The spelling of 349987 in words is "three hundred forty-nine thousand, nine hundred eighty-seven".