653987 has 8 divisors (see below), whose sum is σ = 682176. Its totient is φ = 626472.

The previous prime is 653977. The next prime is 653993. The reversal of 653987 is 789356.

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

It is a cyclic number.

It is not a de Polignac number, because 653987 - 2¹⁴ = 637603 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 653987.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 653987.

It is not an unprimeable number, because it can be changed into a prime (653927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2768 + ... + 2994.

It is an arithmetic number, because the mean of its divisors is an integer number (85272).

2⁶⁵³⁹⁸⁷ is an apocalyptic number.

653987 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

653987 is a deficient number, since it is larger than the sum of its proper divisors (28189).

653987 is a wasteful number, since it uses less digits than its factorization.

653987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337.

The product of its digits is 45360, while the sum is 38.

The square root of 653987 is about 808.6946271616. The cubic root of 653987 is about 86.8006622161.

The spelling of 653987 in words is "six hundred fifty-three thousand, nine hundred eighty-seven".