38889666 has 16 divisors (see below), whose sum is σ = 86421600. Its totient is φ = 12963204.

The previous prime is 38889661. The next prime is 38889671. The reversal of 38889666 is 66698883.

It is an interprime number because it is at equal distance from previous prime (38889661) and next prime (38889671).

It is a super-2 number, since 2×38889666² = 3024812243183112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 720179 = 38889666 / (3 + 8 + 8 + 8 + 9 + 6 + 6 + 6).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (38889661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360036 + ... + 360143.

It is an arithmetic number, because the mean of its divisors is an integer number (5401350).

Almost surely, 2^38889666 is an apocalyptic number.

38889666 is an abundant number, since it is smaller than the sum of its proper divisors (47531934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

38889666 is a wasteful number, since it uses less digits than its factorization.

38889666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720190 (or 720184 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The square root of 38889666 is about 6236.1579518162. The cubic root of 38889666 is about 338.8010423125.

The spelling of 38889666 in words is "thirty-eight million, eight hundred eighty-nine thousand, six hundred sixty-six".