38918642 has 48 divisors (see below), whose sum is σ = 70917120. Its totient is φ = 15960672.

The previous prime is 38918641. The next prime is 38918647. The reversal of 38918642 is 24681983.

Added to its reverse (24681983) it gives a square (63600625 = 7975²).

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 38918642.

It is not an unprimeable number, because it can be changed into a prime (38918641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 306383 + ... + 306509.

It is an arithmetic number, because the mean of its divisors is an integer number (1477440).

Almost surely, 2^38918642 is an apocalyptic number.

38918642 is a deficient number, since it is larger than the sum of its proper divisors (31998478).

38918642 is a wasteful number, since it uses less digits than its factorization.

38918642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 248 counting only the distinct ones).

The product of its digits is 82944, while the sum is 41.

The square root of 38918642 is about 6238.4807445403. The cubic root of 38918642 is about 338.8851663043.

Adding to 38918642 its reverse (24681983), we get a square (63600625 = 7975²).

The spelling of 38918642 in words is "thirty-eight million, nine hundred eighteen thousand, six hundred forty-two".