201988 has 6 divisors (see below), whose sum is σ = 353486. Its totient is φ = 100992.

The previous prime is 201979. The next prime is 201997. The reversal of 201988 is 889102.

It is an interprime number because it is at equal distance from previous prime (201979) and next prime (201997).

It can be written as a sum of positive squares in only one way, i.e., 135424 + 66564 = 368^2 + 258^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25245 + ... + 25252.

2²⁰¹⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

201988 is a deficient number, since it is larger than the sum of its proper divisors (151498).

201988 is a wasteful number, since it uses less digits than its factorization.

201988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50501 (or 50499 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 201988 is about 449.4307510618. The cubic root of 201988 is about 58.6734811873.

The spelling of 201988 in words is "two hundred one thousand, nine hundred eighty-eight".