201638190 has 96 divisors (see below), whose sum is σ = 553926240. Its totient is φ = 46688256.

The previous prime is 201638153. The next prime is 201638201. The reversal of 201638190 is 91836102.

It is a super-2 number, since 2×201638190² = 81315919332952200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 111816 + ... + 113604.

It is an arithmetic number, because the mean of its divisors is an integer number (5770065).

Almost surely, 2^201638190 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201638190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276963120).

201638190 is an abundant number, since it is smaller than the sum of its proper divisors (352288050).

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

201638190 is a wasteful number, since it uses less digits than its factorization.

201638190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1846 (or 1829 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 201638190 is about 14199.9362674626. The cubic root of 201638190 is about 586.3959067522.

The spelling of 201638190 in words is "two hundred one million, six hundred thirty-eight thousand, one hundred ninety".