201990388 has 12 divisors (see below), whose sum is σ = 353767680. Its totient is φ = 100913912.

The previous prime is 201990361. The next prime is 201990421. The reversal of 201990388 is 883099102.

It is a self number, because there is not a number n which added to its sum of digits gives 201990388.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14548 + ... + 24811.

It is an arithmetic number, because the mean of its divisors is an integer number (29480640).

Almost surely, 2^201990388 is an apocalyptic number.

It is an amenable number.

201990388 is a deficient number, since it is larger than the sum of its proper divisors (151777292).

201990388 is a wasteful number, since it uses less digits than its factorization.

201990388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40646 (or 40644 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 201990388 is about 14212.3322505492. The cubic root of 201990388 is about 586.7371240849.

The spelling of 201990388 in words is "two hundred one million, nine hundred ninety thousand, three hundred eighty-eight".