19740987 has 48 divisors (see below), whose sum is σ = 34145280. Its totient is φ = 10757376.

The previous prime is 19740983. The next prime is 19740991. The reversal of 19740987 is 78904791.

It is an interprime number because it is at equal distance from previous prime (19740983) and next prime (19740991).

It is not a de Polignac number, because 19740987 - 2² = 19740983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19740983) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 174643 + ... + 174755.

It is an arithmetic number, because the mean of its divisors is an integer number (711360).

Almost surely, 2^19740987 is an apocalyptic number.

19740987 is a deficient number, since it is larger than the sum of its proper divisors (14404293).

19740987 is a wasteful number, since it uses less digits than its factorization.

19740987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 19740987 is about 4443.0830512157. The cubic root of 19740987 is about 270.2648840828.

The spelling of 19740987 in words is "nineteen million, seven hundred forty thousand, nine hundred eighty-seven".