1987119378 has 24 divisors (see below), whose sum is σ = 4464886608. Its totient is φ = 662372964.

The previous prime is 1987119331. The next prime is 1987119401. The reversal of 1987119378 is 8739117891.

1987119378 is a `hidden beast` number, since 198 + 71 + 19 + 378 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2043876 + ... + 2044847.

It is an arithmetic number, because the mean of its divisors is an integer number (186036942).

Almost surely, 2^1987119378 is an apocalyptic number.

1987119378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1987119378 is an abundant number, since it is smaller than the sum of its proper divisors (2477767230).

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

1987119378 is an equidigital number, since it uses as much as digits as its factorization.

1987119378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4088740 (or 4088728 counting only the distinct ones).

The product of its digits is 762048, while the sum is 54.

The square root of 1987119378 is about 44577.1172015419. The cubic root of 1987119378 is about 1257.2104613967.

The spelling of 1987119378 in words is "one billion, nine hundred eighty-seven million, one hundred nineteen thousand, three hundred seventy-eight".