402740 has 24 divisors (see below), whose sum is σ = 911400. Its totient is φ = 148608.

The previous prime is 402739. The next prime is 402751. The reversal of 402740 is 47204.

402740 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 784 + 401956 = 28^2 + 634^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 515 + ... + 1034.

It is an arithmetic number, because the mean of its divisors is an integer number (37975).

2⁴⁰²⁷⁴⁰ is an apocalyptic number.

It is an amenable number.

402740 is an abundant number, since it is smaller than the sum of its proper divisors (508660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

402740 is a wasteful number, since it uses less digits than its factorization.

402740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571 (or 1569 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 17.

The square root of 402740 is about 634.6179953326. The cubic root of 402740 is about 73.8484847243.

Adding to 402740 its reverse (47204), we get a palindrome (449944).

The spelling of 402740 in words is "four hundred two thousand, seven hundred forty", and thus it is an iban number.