653989 has 4 divisors (see below), whose sum is σ = 747424. Its totient is φ = 560556.

The previous prime is 653977. The next prime is 653993. The reversal of 653989 is 989356.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-653989 is a prime.

It is a super-2 number, since 2×653989² = 855403224242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (653929) 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, 46707 + ... + 46720.

It is an arithmetic number, because the mean of its divisors is an integer number (186856).

2⁶⁵³⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

653989 is a deficient number, since it is larger than the sum of its proper divisors (93435).

653989 is an equidigital number, since it uses as much as digits as its factorization.

653989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93434.

The product of its digits is 58320, while the sum is 40.

The square root of 653989 is about 808.6958637213. The cubic root of 653989 is about 86.8007506996.

The spelling of 653989 in words is "six hundred fifty-three thousand, nine hundred eighty-nine".