1987955 has 4 divisors (see below), whose sum is σ = 2385552. Its totient is φ = 1590360.

The previous prime is 1987939. The next prime is 1987969. The reversal of 1987955 is 5597891.

It is a happy number.

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

It is not a de Polignac number, because 1987955 - 2⁴ = 1987939 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 198791 + ... + 198800.

It is an arithmetic number, because the mean of its divisors is an integer number (596388).

2^1987955 is an apocalyptic number.

1987955 is a deficient number, since it is larger than the sum of its proper divisors (397597).

1987955 is an equidigital number, since it uses as much as digits as its factorization.

1987955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397596.

The product of its digits is 113400, while the sum is 44.

The square root of 1987955 is about 1409.9485806227. The cubic root of 1987955 is about 125.7386663777.

The spelling of 1987955 in words is "one million, nine hundred eighty-seven thousand, nine hundred fifty-five".