1686231492 has 48 divisors (see below), whose sum is σ = 4299117312. Its totient is φ = 510158880.

The previous prime is 1686231487. The next prime is 1686231493. The reversal of 1686231492 is 2941326861.

It is a super-2 number, since 2×1686231492² = 5686753289225092128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1686231493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74943 + ... + 94809.

It is an arithmetic number, because the mean of its divisors is an integer number (89564944).

Almost surely, 2^1686231492 is an apocalyptic number.

1686231492 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1686231492 is an abundant number, since it is smaller than the sum of its proper divisors (2612885820).

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

1686231492 is a wasteful number, since it uses less digits than its factorization.

1686231492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20528 (or 20526 counting only the distinct ones).

The product of its digits is 124416, while the sum is 42.

The square root of 1686231492 is about 41063.7491225533. The cubic root of 1686231492 is about 1190.2523985022.

The spelling of 1686231492 in words is "one billion, six hundred eighty-six million, two hundred thirty-one thousand, four hundred ninety-two".