381111978 has 32 divisors (see below), whose sum is σ = 856550016. Its totient is φ = 112166208.

The previous prime is 381111977. The next prime is 381111979. The reversal of 381111978 is 879111183.

It is an interprime number because it is at equal distance from previous prime (381111977) and next prime (381111979).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (381111977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104425 + ... + 108012.

It is an arithmetic number, because the mean of its divisors is an integer number (26767188).

Almost surely, 2^381111978 is an apocalyptic number.

381111978 is an abundant number, since it is smaller than the sum of its proper divisors (475438038).

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

381111978 is a wasteful number, since it uses less digits than its factorization.

381111978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212478.

The product of its digits is 12096, while the sum is 39.

The square root of 381111978 is about 19522.0894885768. The cubic root of 381111978 is about 725.0214677749.

The spelling of 381111978 in words is "three hundred eighty-one million, one hundred eleven thousand, nine hundred seventy-eight".