388742 has 4 divisors (see below), whose sum is σ = 583116. Its totient is φ = 194370.

The previous prime is 388727. The next prime is 388757. The reversal of 388742 is 247883.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 247883 = 487 ⋅509.

It is an interprime number because it is at equal distance from previous prime (388727) and next prime (388757).

It is a super-2 number, since 2×388742² = 302240685128, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 388699 and 388708.

It is a congruent number.

It is an unprimeable number.

388742 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97184 + ... + 97187.

It is an arithmetic number, because the mean of its divisors is an integer number (145779).

2³⁸⁸⁷⁴² is an apocalyptic number.

388742 is a deficient number, since it is larger than the sum of its proper divisors (194374).

388742 is a wasteful number, since it uses less digits than its factorization.

388742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194373.

The product of its digits is 10752, while the sum is 32.

The square root of 388742 is about 623.4917802185. The cubic root of 388742 is about 72.9827944689.

The spelling of 388742 in words is "three hundred eighty-eight thousand, seven hundred forty-two".