190621 has 4 divisors (see below), whose sum is σ = 201852. Its totient is φ = 179392.

The previous prime is 190613. The next prime is 190633. The reversal of 190621 is 126091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126091 = 7 ⋅18013.

It can be written as a sum of positive squares in 2 ways, for example, as 68121 + 122500 = 261^2 + 350^2 .

It is a cyclic number.

It is not a de Polignac number, because 190621 - 2³ = 190613 is a prime.

It is a Duffinian number.

190621 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190121) 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, 5590 + ... + 5623.

It is an arithmetic number, because the mean of its divisors is an integer number (50463).

2¹⁹⁰⁶²¹ is an apocalyptic number.

It is an amenable number.

190621 is a deficient number, since it is larger than the sum of its proper divisors (11231).

190621 is a wasteful number, since it uses less digits than its factorization.

190621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11230.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 190621 is about 436.6016491036. The cubic root of 190621 is about 57.5515353972.

The spelling of 190621 in words is "one hundred ninety thousand, six hundred twenty-one".