38181818 has 4 divisors (see below), whose sum is σ = 57272730. Its totient is φ = 19090908.

The previous prime is 38181797. The next prime is 38181823. The reversal of 38181818 is 81818183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81818183 = 233 ⋅351151.

It can be written as a sum of positive squares in only one way, i.e., 28590409 + 9591409 = 5347^2 + 3097^2 .

It is an alternating number because its digits alternate between odd and even.

38181818 is a modest number, since divided by 181818 gives 38 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9545453 + ... + 9545456.

Almost surely, 2^38181818 is an apocalyptic number.

38181818 is a deficient number, since it is larger than the sum of its proper divisors (19090912).

38181818 is a wasteful number, since it uses less digits than its factorization.

38181818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19090911.

The product of its digits is 12288, while the sum is 38.

The square root of 38181818 is about 6179.1437918210. The cubic root of 38181818 is about 336.7328874520.

The spelling of 38181818 in words is "thirty-eight million, one hundred eighty-one thousand, eight hundred eighteen".