1987406 has 4 divisors (see below), whose sum is σ = 2981112. Its totient is φ = 993702.

The previous prime is 1987373. The next prime is 1987411. The reversal of 1987406 is 6047891.

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

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, 496850 + ... + 496853.

It is an arithmetic number, because the mean of its divisors is an integer number (745278).

2^1987406 is an apocalyptic number.

1987406 is a deficient number, since it is larger than the sum of its proper divisors (993706).

1987406 is an equidigital number, since it uses as much as digits as its factorization.

1987406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993705.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1987406 is about 1409.7538792286. The cubic root of 1987406 is about 125.7270905149.

The spelling of 1987406 in words is "one million, nine hundred eighty-seven thousand, four hundred six".