1940381587 has 4 divisors (see below), whose sum is σ = 1940717520. Its totient is φ = 1940045656.

The previous prime is 1940381497. The next prime is 1940381603. The reversal of 1940381587 is 7851830491.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1940381587 - 2⁷ = 1940381459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1946381587) 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, 159148 + ... + 170905.

It is an arithmetic number, because the mean of its divisors is an integer number (485179380).

Almost surely, 2^1940381587 is an apocalyptic number.

1940381587 is a deficient number, since it is larger than the sum of its proper divisors (335933).

1940381587 is an equidigital number, since it uses as much as digits as its factorization.

1940381587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335932.

The product of its (nonzero) digits is 241920, while the sum is 46.

The square root of 1940381587 is about 44049.7626213808. The cubic root of 1940381587 is about 1247.2754710950.

It can be divided in two parts, 194038 and 1587, that added together give a triangular number (195625 = T₆₂₅).

The spelling of 1940381587 in words is "one billion, nine hundred forty million, three hundred eighty-one thousand, five hundred eighty-seven".