646597 has 8 divisors (see below), whose sum is σ = 749952. Its totient is φ = 546000.

The previous prime is 646577. The next prime is 646609. The reversal of 646597 is 795646.

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

It is not a de Polignac number, because 646597 - 2¹¹ = 644549 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646537) 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, 154 + ... + 1147.

It is an arithmetic number, because the mean of its divisors is an integer number (93744).

2⁶⁴⁶⁵⁹⁷ is an apocalyptic number.

It is an amenable number.

646597 is a deficient number, since it is larger than the sum of its proper divisors (103355).

646597 is a wasteful number, since it uses less digits than its factorization.

646597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379.

The product of its digits is 45360, while the sum is 37.

The square root of 646597 is about 804.1125543107. The cubic root of 646597 is about 86.4724761239.

The spelling of 646597 in words is "six hundred forty-six thousand, five hundred ninety-seven".