351998 has 8 divisors (see below), whose sum is σ = 540408. Its totient is φ = 171864.

The previous prime is 351991. The next prime is 352007. The reversal of 351998 is 899153.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (351991) 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, 1961 + ... + 2132.

It is an arithmetic number, because the mean of its divisors is an integer number (67551).

2³⁵¹⁹⁹⁸ is an apocalyptic number.

351998 is a deficient number, since it is larger than the sum of its proper divisors (188410).

351998 is a wasteful number, since it uses less digits than its factorization.

351998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4138.

The product of its digits is 9720, while the sum is 35.

The square root of 351998 is about 593.2941934656. The cubic root of 351998 is about 70.6068329810.

The spelling of 351998 in words is "three hundred fifty-one thousand, nine hundred ninety-eight".