653990 has 16 divisors (see below), whose sum is σ = 1246752. Its totient is φ = 246144.

The previous prime is 653977. The next prime is 653993. The reversal of 653990 is 99356.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 653990.

It is not an unprimeable number, because it can be changed into a prime (653993) by changing a digit.

653990 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1754 + ... + 2093.

It is an arithmetic number, because the mean of its divisors is an integer number (77922).

2⁶⁵³⁹⁹⁰ is an apocalyptic number.

653990 is a deficient number, since it is larger than the sum of its proper divisors (592762).

653990 is a wasteful number, since it uses less digits than its factorization.

653990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3871.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 653990 is about 808.6964820005. The cubic root of 653990 is about 86.8007949413.

The spelling of 653990 in words is "six hundred fifty-three thousand, nine hundred ninety".