653994 has 40 divisors (see below), whose sum is σ = 1603008. Its totient is φ = 197640.

The previous prime is 653993. The next prime is 654001. The reversal of 653994 is 499356.

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

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1599 + ... + 1965.

2⁶⁵³⁹⁹⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 653994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (801504).

653994 is an abundant number, since it is smaller than the sum of its proper divisors (949014).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

653994 is a wasteful number, since it uses less digits than its factorization.

653994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392 (or 383 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 653994 is about 808.6989551125. The cubic root of 653994 is about 86.8009719075.

The spelling of 653994 in words is "six hundred fifty-three thousand, nine hundred ninety-four".