201990492 has 36 divisors (see below), whose sum is σ = 557005176. Its totient is φ = 61209120.

The previous prime is 201990469. The next prime is 201990497. The reversal of 201990492 is 294099102.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201990497) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 254643 + ... + 255434.

It is an arithmetic number, because the mean of its divisors is an integer number (15472366).

Almost surely, 2^201990492 is an apocalyptic number.

201990492 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

201990492 is an abundant number, since it is smaller than the sum of its proper divisors (355014684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201990492 is a wasteful number, since it uses less digits than its factorization.

201990492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510098 (or 510093 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 201990492 is about 14212.3359093430. The cubic root of 201990492 is about 586.7372247839.

The spelling of 201990492 in words is "two hundred one million, nine hundred ninety thousand, four hundred ninety-two".