400742 has 4 divisors (see below), whose sum is σ = 601116. Its totient is φ = 200370.

The previous prime is 400739. The next prime is 400753. The reversal of 400742 is 247004.

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

It is a self number, because there is not a number n which added to its sum of digits gives 400742.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 400742.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100184 + ... + 100187.

It is an arithmetic number, because the mean of its divisors is an integer number (150279).

2⁴⁰⁰⁷⁴² is an apocalyptic number.

400742 is a deficient number, since it is larger than the sum of its proper divisors (200374).

400742 is a wasteful number, since it uses less digits than its factorization.

400742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200373.

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

The square root of 400742 is about 633.0418627547. The cubic root of 400742 is about 73.7261610206.

Adding to 400742 its reverse (247004), we get a palindrome (647746).

The spelling of 400742 in words is "four hundred thousand, seven hundred forty-two", and thus it is an iban number.