653966 has 4 divisors (see below), whose sum is σ = 980952. Its totient is φ = 326982.

The previous prime is 653963. The next prime is 653969. The reversal of 653966 is 669356.

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

It is an interprime number because it is at equal distance from previous prime (653963) and next prime (653969).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (653963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163490 + ... + 163493.

It is an arithmetic number, because the mean of its divisors is an integer number (245238).

2⁶⁵³⁹⁶⁶ is an apocalyptic number.

653966 is a deficient number, since it is larger than the sum of its proper divisors (326986).

653966 is a wasteful number, since it uses less digits than its factorization.

653966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326985.

The product of its digits is 29160, while the sum is 35.

The square root of 653966 is about 808.6816431699. The cubic root of 653966 is about 86.7997331286.

The spelling of 653966 in words is "six hundred fifty-three thousand, nine hundred sixty-six".