890621 has 4 divisors (see below), whose sum is σ = 893244. Its totient is φ = 888000.

The previous prime is 890609. The next prime is 890653. The reversal of 890621 is 126098.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 784996 + 105625 = 886^2 + 325^2 .

It is a cyclic number.

It is not a de Polignac number, because 890621 - 2¹⁰ = 889597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 890621.

It is not an unprimeable number, because it can be changed into a prime (890671) 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, 710 + ... + 1511.

It is an arithmetic number, because the mean of its divisors is an integer number (223311).

2⁸⁹⁰⁶²¹ is an apocalyptic number.

It is an amenable number.

890621 is a deficient number, since it is larger than the sum of its proper divisors (2623).

890621 is a wasteful number, since it uses less digits than its factorization.

890621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2622.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 890621 is about 943.7271851547. The cubic root of 890621 is about 96.2123842442.

The spelling of 890621 in words is "eight hundred ninety thousand, six hundred twenty-one".