1987967 has 4 divisors (see below), whose sum is σ = 2036496. Its totient is φ = 1939440.

The previous prime is 1987939. The next prime is 1987969. The reversal of 1987967 is 7697891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7697891 = 71 ⋅108421.

It is a cyclic number.

It is not a de Polignac number, because 1987967 - 2¹² = 1983871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987969) 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, 24203 + ... + 24284.

It is an arithmetic number, because the mean of its divisors is an integer number (509124).

2^1987967 is an apocalyptic number.

1987967 is a deficient number, since it is larger than the sum of its proper divisors (48529).

1987967 is an equidigital number, since it uses as much as digits as its factorization.

1987967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48528.

The product of its digits is 190512, while the sum is 47.

The square root of 1987967 is about 1409.9528360906. The cubic root of 1987967 is about 125.7389193783.

The spelling of 1987967 in words is "one million, nine hundred eighty-seven thousand, nine hundred sixty-seven".