190640 has 20 divisors (see below), whose sum is σ = 443424. Its totient is φ = 76224.

The previous prime is 190639. The next prime is 190649. The reversal of 190640 is 46091.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (190649) 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, 1112 + ... + 1271.

2¹⁹⁰⁶⁴⁰ is an apocalyptic number.

190640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

190640 is an abundant number, since it is smaller than the sum of its proper divisors (252784).

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

190640 is a wasteful number, since it uses less digits than its factorization.

190640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2396 (or 2390 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 190640 is about 436.6234075264. The cubic root of 190640 is about 57.5534474685.

The spelling of 190640 in words is "one hundred ninety thousand, six hundred forty".