402749 has 4 divisors (see below), whose sum is σ = 404064. Its totient is φ = 401436.

The previous prime is 402739. The next prime is 402751. The reversal of 402749 is 947204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 402749 - 2¹⁶ = 337213 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402739) 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, 74 + ... + 900.

It is an arithmetic number, because the mean of its divisors is an integer number (101016).

2⁴⁰²⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

402749 is a deficient number, since it is larger than the sum of its proper divisors (1315).

402749 is an equidigital number, since it uses as much as digits as its factorization.

402749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1314.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 402749 is about 634.6250861729. The cubic root of 402749 is about 73.8490348157.

The spelling of 402749 in words is "four hundred two thousand, seven hundred forty-nine".