1531986 has 16 divisors (see below), whose sum is σ = 3077568. Its totient is φ = 508400.

The previous prime is 1531909. The next prime is 1531987. The reversal of 1531986 is 6891351.

It is a super-2 number, since 2×1531986² = 4693962208392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1531987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1456 + ... + 2276.

It is an arithmetic number, because the mean of its divisors is an integer number (192348).

2^1531986 is an apocalyptic number.

1531986 is an abundant number, since it is smaller than the sum of its proper divisors (1545582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1531986 is a wasteful number, since it uses less digits than its factorization.

1531986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1137.

The product of its digits is 6480, while the sum is 33.

The square root of 1531986 is about 1237.7342202589. The cubic root of 1531986 is about 115.2793711795.

The spelling of 1531986 in words is "one million, five hundred thirty-one thousand, nine hundred eighty-six".