351987 has 4 divisors (see below), whose sum is σ = 469320. Its totient is φ = 234656.

The previous prime is 351971. The next prime is 351991. The reversal of 351987 is 789153.

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 351987 - 2⁴ = 351971 is a prime.

It is a D-number.

351987 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 351987.

It is not an unprimeable number, because it can be changed into a prime (351287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58662 + ... + 58667.

It is an arithmetic number, because the mean of its divisors is an integer number (117330).

2³⁵¹⁹⁸⁷ is an apocalyptic number.

351987 is a deficient number, since it is larger than the sum of its proper divisors (117333).

351987 is a wasteful number, since it uses less digits than its factorization.

351987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117332.

The product of its digits is 7560, while the sum is 33.

The square root of 351987 is about 593.2849231187. The cubic root of 351987 is about 70.6060974813.

It can be divided in two parts, 3519 and 87, that multiplied together give a triangular number (306153 = T₇₈₂).

The spelling of 351987 in words is "three hundred fifty-one thousand, nine hundred eighty-seven".