1987654 has 4 divisors (see below), whose sum is σ = 2981484. Its totient is φ = 993826.

The previous prime is 1987649. The next prime is 1987673. The reversal of 1987654 is 4567891.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a d-powerful number, because it can be written as 1 + 9⁶ + 8⁵ + 7⁵ + 6⁷ + 5⁷ + 4¹⁰ .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496912 + ... + 496915.

It is an arithmetic number, because the mean of its divisors is an integer number (745371).

2^1987654 is an apocalyptic number.

1987654 is a deficient number, since it is larger than the sum of its proper divisors (993830).

1987654 is an equidigital number, since it uses as much as digits as its factorization.

1987654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993829.

The product of its digits is 60480, while the sum is 40.

The square root of 1987654 is about 1409.8418351007. The cubic root of 1987654 is about 125.7323199482.

The spelling of 1987654 in words is "one million, nine hundred eighty-seven thousand, six hundred fifty-four".