653983 has 4 divisors (see below), whose sum is σ = 713448. Its totient is φ = 594520.

The previous prime is 653977. The next prime is 653993. The reversal of 653983 is 389356.

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

It is a cyclic number.

It is not a de Polignac number, because 653983 - 2⁵ = 653951 is a prime.

It is a Duffinian number.

653983 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (653903) 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, 29716 + ... + 29737.

It is an arithmetic number, because the mean of its divisors is an integer number (178362).

2⁶⁵³⁹⁸³ is an apocalyptic number.

653983 is a deficient number, since it is larger than the sum of its proper divisors (59465).

653983 is a wasteful number, since it uses less digits than its factorization.

653983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59464.

The product of its digits is 19440, while the sum is 34.

The square root of 653983 is about 808.6921540364. The cubic root of 653983 is about 86.8004852486.

The spelling of 653983 in words is "six hundred fifty-three thousand, nine hundred eighty-three".