39840238 has 4 divisors (see below), whose sum is σ = 59760360. Its totient is φ = 19920118.

The previous prime is 39840223. The next prime is 39840247. The reversal of 39840238 is 83204893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83204893 = 5003 ⋅16631.

It is a junction number, because it is equal to n+sod(n) for n = 39840197 and 39840206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9960058 + ... + 9960061.

It is an arithmetic number, because the mean of its divisors is an integer number (14940090).

Almost surely, 2^39840238 is an apocalyptic number.

39840238 is a deficient number, since it is larger than the sum of its proper divisors (19920122).

39840238 is a wasteful number, since it uses less digits than its factorization.

39840238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19920121.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 39840238 is about 6311.9123884921. The cubic root of 39840238 is about 341.5392665073.

The spelling of 39840238 in words is "thirty-nine million, eight hundred forty thousand, two hundred thirty-eight".