381867978 has 8 divisors (see below), whose sum is σ = 763735968. Its totient is φ = 127289324.

The previous prime is 381867961. The next prime is 381867979. The reversal of 381867978 is 879768183.

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

381867978 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (381867979) 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, 31822326 + ... + 31822337.

It is an arithmetic number, because the mean of its divisors is an integer number (95466996).

Almost surely, 2^381867978 is an apocalyptic number.

381867978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

381867978 is a wasteful number, since it uses less digits than its factorization.

381867978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63644668.

The product of its digits is 4064256, while the sum is 57.

The square root of 381867978 is about 19541.4425772510. The cubic root of 381867978 is about 725.5005519926.

It can be divided in two parts, 38186 and 7978, that added together give a palindrome (46164).

The spelling of 381867978 in words is "three hundred eighty-one million, eight hundred sixty-seven thousand, nine hundred seventy-eight".