1987423 has 4 divisors (see below), whose sum is σ = 2003200. Its totient is φ = 1971648.

The previous prime is 1987411. The next prime is 1987429. The reversal of 1987423 is 3247891.

1987423 is nontrivially palindromic in base 6.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3247891 = 59 ⋅55049.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1987423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7698 + ... + 7951.

It is an arithmetic number, because the mean of its divisors is an integer number (500800).

2^1987423 is an apocalyptic number.

1987423 is a deficient number, since it is larger than the sum of its proper divisors (15777).

1987423 is a wasteful number, since it uses less digits than its factorization.

1987423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15776.

The product of its digits is 12096, while the sum is 34.

The square root of 1987423 is about 1409.7599086369. The cubic root of 1987423 is about 125.7274489980.

The spelling of 1987423 in words is "one million, nine hundred eighty-seven thousand, four hundred twenty-three".