662391 has 8 divisors (see below), whose sum is σ = 981360. Its totient is φ = 441576.

The previous prime is 662369. The next prime is 662401. The reversal of 662391 is 193266.

It is a happy number.

It is not a de Polignac number, because 662391 - 2⁶ = 662327 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 24533 = 662391 / (6 + 6 + 2 + 3 + 9 + 1).

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (662351) 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, 12240 + ... + 12293.

It is an arithmetic number, because the mean of its divisors is an integer number (122670).

2⁶⁶²³⁹¹ is an apocalyptic number.

662391 is a deficient number, since it is larger than the sum of its proper divisors (318969).

662391 is a wasteful number, since it uses less digits than its factorization.

662391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24542 (or 24536 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 662391 is about 813.8740688829. The cubic root of 662391 is about 87.1708888460.

The spelling of 662391 in words is "six hundred sixty-two thousand, three hundred ninety-one".