978623 has 6 divisors (see below), whose sum is σ = 998712. Its totient is φ = 958920.

The previous prime is 978619. The next prime is 978643. The reversal of 978623 is 326879.

It is not a de Polignac number, because 978623 - 2² = 978619 is a prime.

It is a super-2 number, since 2×978623² = 1915405952258, which contains 22 as substring.

It is a Duffinian number.

Its product of digits (18144) is a multiple of the sum of its prime divisors (324).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3590 + ... + 3852.

It is an arithmetic number, because the mean of its divisors is an integer number (166452).

2⁹⁷⁸⁶²³ is an apocalyptic number.

978623 is a deficient number, since it is larger than the sum of its proper divisors (20089).

978623 is an equidigital number, since it uses as much as digits as its factorization.

978623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385 (or 324 counting only the distinct ones).

The product of its digits is 18144, while the sum is 35.

The square root of 978623 is about 989.2537591538. The cubic root of 978623 is about 99.2822946466.

The spelling of 978623 in words is "nine hundred seventy-eight thousand, six hundred twenty-three".