653869 has 4 divisors (see below), whose sum is σ = 655996. Its totient is φ = 651744.

The previous prime is 653831. The next prime is 653879. The reversal of 653869 is 968356.

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

It can be written as a sum of positive squares in 2 ways, for example, as 149769 + 504100 = 387^2 + 710^2 .

It is a cyclic number.

It is not a de Polignac number, because 653869 - 2⁹ = 653357 is a prime.

It is a super-2 number, since 2×653869² = 855089338322, which contains 22 as substring.

It is a Duffinian number.

653869 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (653819) 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, 504 + ... + 1249.

It is an arithmetic number, because the mean of its divisors is an integer number (163999).

2⁶⁵³⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

653869 is a deficient number, since it is larger than the sum of its proper divisors (2127).

653869 is a wasteful number, since it uses less digits than its factorization.

653869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2126.

The product of its digits is 38880, while the sum is 37.

The square root of 653869 is about 808.6216667886. The cubic root of 653869 is about 86.7954413712.

The spelling of 653869 in words is "six hundred fifty-three thousand, eight hundred sixty-nine".