1987845 has 8 divisors (see below), whose sum is σ = 3180576. Its totient is φ = 1060176.

The previous prime is 1987841. The next prime is 1987849. The reversal of 1987845 is 5487891.

It is an interprime number because it is at equal distance from previous prime (1987841) and next prime (1987849).

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

It is not a de Polignac number, because 1987845 - 2² = 1987841 is a prime.

1987845 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1987797 and 1987806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66247 + ... + 66276.

It is an arithmetic number, because the mean of its divisors is an integer number (397572).

2^1987845 is an apocalyptic number.

1987845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1987845 is a deficient number, since it is larger than the sum of its proper divisors (1192731).

1987845 is a wasteful number, since it uses less digits than its factorization.

1987845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132531.

The product of its digits is 80640, while the sum is 42.

The square root of 1987845 is about 1409.9095715683. The cubic root of 1987845 is about 125.7363471588.

The spelling of 1987845 in words is "one million, nine hundred eighty-seven thousand, eight hundred forty-five".