1987670 has 16 divisors (see below), whose sum is σ = 3611520. Its totient is φ = 787584.

The previous prime is 1987649. The next prime is 1987673. The reversal of 1987670 is 767891.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251 + ... + 2009.

It is an arithmetic number, because the mean of its divisors is an integer number (225720).

2^1987670 is an apocalyptic number.

1987670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1987670 is a deficient number, since it is larger than the sum of its proper divisors (1623850).

1987670 is a wasteful number, since it uses less digits than its factorization.

1987670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1879.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 1987670 is about 1409.8475094846. The cubic root of 1987670 is about 125.7326573161.

The spelling of 1987670 in words is "one million, nine hundred eighty-seven thousand, six hundred seventy".