393742 has 4 divisors (see below), whose sum is σ = 590616. Its totient is φ = 196870.

The previous prime is 393739. The next prime is 393749. The reversal of 393742 is 247393.

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 393742.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98434 + ... + 98437.

It is an arithmetic number, because the mean of its divisors is an integer number (147654).

2³⁹³⁷⁴² is an apocalyptic number.

393742 is a deficient number, since it is larger than the sum of its proper divisors (196874).

393742 is a wasteful number, since it uses less digits than its factorization.

393742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196873.

The product of its digits is 4536, while the sum is 28.

The square root of 393742 is about 627.4886453156. The cubic root of 393742 is about 73.2943640521.

Adding to 393742 its product of digits (4536), we get a triangular number (398278 = T₈₉₂).

The spelling of 393742 in words is "three hundred ninety-three thousand, seven hundred forty-two".