1686536380 has 48 divisors (see below), whose sum is σ = 3585468096. Its totient is φ = 666316800.

The previous prime is 1686536359. The next prime is 1686536393. The reversal of 1686536380 is 836356861.

It is a happy number.

It is a super-2 number, since 2×1686536380² = 5688809922127008800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1686536380.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1164817 + ... + 1166263.

It is an arithmetic number, because the mean of its divisors is an integer number (74697252).

Almost surely, 2^1686536380 is an apocalyptic number.

1686536380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1686536380 is an abundant number, since it is smaller than the sum of its proper divisors (1898931716).

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

1686536380 is a wasteful number, since it uses less digits than its factorization.

1686536380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2134 (or 2132 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 1686536380 is about 41067.4613288915. The cubic root of 1686536380 is about 1190.3241308050.

The spelling of 1686536380 in words is "one billion, six hundred eighty-six million, five hundred thirty-six thousand, three hundred eighty".