38891978 has 8 divisors (see below), whose sum is σ = 58434372. Its totient is φ = 19413856.

The previous prime is 38891977. The next prime is 38891989. The reversal of 38891978 is 87919883.

It can be written as a sum of positive squares in 2 ways, for example, as 29300569 + 9591409 = 5413^2 + 3097^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (38891977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14525 + ... + 16992.

Almost surely, 2^38891978 is an apocalyptic number.

38891978 is a deficient number, since it is larger than the sum of its proper divisors (19542394).

38891978 is a wasteful number, since it uses less digits than its factorization.

38891978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32136.

The product of its digits is 870912, while the sum is 53.

The square root of 38891978 is about 6236.3433196065. The cubic root of 38891978 is about 338.8077561139.

The spelling of 38891978 in words is "thirty-eight million, eight hundred ninety-one thousand, nine hundred seventy-eight".