1986431 has 4 divisors (see below), whose sum is σ = 2091000. Its totient is φ = 1881864.

The previous prime is 1986421. The next prime is 1986437. The reversal of 1986431 is 1346891.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1986431 - 2¹⁰ = 1985407 is a prime.

It is a super-2 number, since 2×1986431² = 7891816235522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986437) 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, 52256 + ... + 52293.

It is an arithmetic number, because the mean of its divisors is an integer number (522750).

2^1986431 is an apocalyptic number.

1986431 is a deficient number, since it is larger than the sum of its proper divisors (104569).

1986431 is a wasteful number, since it uses less digits than its factorization.

1986431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104568.

The product of its digits is 5184, while the sum is 32.

The square root of 1986431 is about 1409.4080317637. The cubic root of 1986431 is about 125.7065270325.

The spelling of 1986431 in words is "one million, nine hundred eighty-six thousand, four hundred thirty-one".