274639 has 4 divisors (see below), whose sum is σ = 276256. Its totient is φ = 273024.

The previous prime is 274627. The next prime is 274661. The reversal of 274639 is 936472.

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

It is a cyclic number.

It is not a de Polignac number, because 274639 - 2¹³ = 266447 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 274639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (274609) 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, 519 + ... + 904.

It is an arithmetic number, because the mean of its divisors is an integer number (69064).

274639 is a Friedman number, since it can be written as (69-4)^3+7*2, using all its digits and the basic arithmetic operations.

2²⁷⁴⁶³⁹ is an apocalyptic number.

274639 is a deficient number, since it is larger than the sum of its proper divisors (1617).

274639 is a wasteful number, since it uses less digits than its factorization.

274639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616.

The product of its digits is 9072, while the sum is 31.

The square root of 274639 is about 524.0601110560. The cubic root of 274639 is about 65.0011045177.

It can be divided in two parts, 27463 and 9, that added together give a palindrome (27472).

The spelling of 274639 in words is "two hundred seventy-four thousand, six hundred thirty-nine".