290623 has 2 divisors, whose sum is σ = 290624. Its totient is φ = 290622.

The previous prime is 290621. The next prime is 290627. The reversal of 290623 is 326092.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 290623 - 2¹ = 290621 is a prime.

Together with 290621, it forms a pair of twin primes.

290623 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 290594 and 290603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (290621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145311 + 145312.

It is an arithmetic number, because the mean of its divisors is an integer number (145312).

2²⁹⁰⁶²³ is an apocalyptic number.

290623 is a deficient number, since it is larger than the sum of its proper divisors (1).

290623 is an equidigital number, since it uses as much as digits as its factorization.

290623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 290623 is about 539.0946113624. The cubic root of 290623 is about 66.2384244639.

The spelling of 290623 in words is "two hundred ninety thousand, six hundred twenty-three".