390623 has 4 divisors (see below), whose sum is σ = 396048. Its totient is φ = 385200.

The previous prime is 390581. The next prime is 390647. The reversal of 390623 is 326093.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326093 = 59 ⋅5527.

It is a cyclic number.

It is not a de Polignac number, because 390623 - 2⁸ = 390367 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390653) 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, 2603 + ... + 2748.

It is an arithmetic number, because the mean of its divisors is an integer number (99012).

2³⁹⁰⁶²³ is an apocalyptic number.

390623 is a deficient number, since it is larger than the sum of its proper divisors (5425).

390623 is an equidigital number, since it uses as much as digits as its factorization.

390623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5424.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 390623 is about 624.9983999980. The cubic root of 390623 is about 73.1003186970.

The spelling of 390623 in words is "three hundred ninety thousand, six hundred twenty-three".