1994137787 has 8 divisors (see below), whose sum is σ = 2050734672. Its totient is φ = 1937920000.

The previous prime is 1994137777. The next prime is 1994137811. The reversal of 1994137787 is 7877314991.

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

It is a cyclic number.

It is not a de Polignac number, because 1994137787 - 2⁸ = 1994137531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1994137727) 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 7 ways as a sum of consecutive naturals, for example, 84089 + ... + 105162.

It is an arithmetic number, because the mean of its divisors is an integer number (256341834).

Almost surely, 2^1994137787 is an apocalyptic number.

1994137787 is a deficient number, since it is larger than the sum of its proper divisors (56596885).

1994137787 is a wasteful number, since it uses less digits than its factorization.

1994137787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189549.

The product of its digits is 2667168, while the sum is 56.

The square root of 1994137787 is about 44655.7699183431. The cubic root of 1994137787 is about 1258.6888576210.

The spelling of 1994137787 in words is "one billion, nine hundred ninety-four million, one hundred thirty-seven thousand, seven hundred eighty-seven".