405742 has 8 divisors (see below), whose sum is σ = 625176. Its totient is φ = 197352.

The previous prime is 405731. The next prime is 405749. The reversal of 405742 is 247504.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405749) 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, 2668 + ... + 2815.

It is an arithmetic number, because the mean of its divisors is an integer number (78147).

2⁴⁰⁵⁷⁴² is an apocalyptic number.

405742 is a deficient number, since it is larger than the sum of its proper divisors (219434).

405742 is a wasteful number, since it uses less digits than its factorization.

405742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5522.

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 405742 is about 636.9788065548. The cubic root of 405742 is about 74.0315181054.

The spelling of 405742 in words is "four hundred five thousand, seven hundred forty-two".