652391 has 4 divisors (see below), whose sum is σ = 654192. Its totient is φ = 650592.

The previous prime is 652381. The next prime is 652411. The reversal of 652391 is 193256.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-652391 is a prime.

It is a super-2 number, since 2×652391² = 851228033762, which contains 22 as substring.

It is an Ulam number.

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 652391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (652321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146 + ... + 1151.

It is an arithmetic number, because the mean of its divisors is an integer number (163548).

2⁶⁵²³⁹¹ is an apocalyptic number.

652391 is a deficient number, since it is larger than the sum of its proper divisors (1801).

652391 is a wasteful number, since it uses less digits than its factorization.

652391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800.

The product of its digits is 1620, while the sum is 26.

The square root of 652391 is about 807.7072489461. The cubic root of 652391 is about 86.7299948057.

The spelling of 652391 in words is "six hundred fifty-two thousand, three hundred ninety-one".