653945 has 8 divisors (see below), whose sum is σ = 810240. Its totient is φ = 506160.

The previous prime is 653941. The next prime is 653951. The reversal of 653945 is 549356.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 653945 - 2² = 653941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (653941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1955 + ... + 2264.

It is an arithmetic number, because the mean of its divisors is an integer number (101280).

2⁶⁵³⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

653945 is a deficient number, since it is larger than the sum of its proper divisors (156295).

653945 is a wasteful number, since it uses less digits than its factorization.

653945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4255.

The product of its digits is 16200, while the sum is 32.

The square root of 653945 is about 808.6686589698. The cubic root of 653945 is about 86.7988040213.

The spelling of 653945 in words is "six hundred fifty-three thousand, nine hundred forty-five".