1681173732 has 144 divisors (see below), whose sum is σ = 4969944000. Its totient is φ = 439278336.

The previous prime is 1681173731. The next prime is 1681173733. The reversal of 1681173732 is 2373711861.

It is an interprime number because it is at equal distance from previous prime (1681173731) and next prime (1681173733).

It is not an unprimeable number, because it can be changed into a prime (1681173731) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 321394 + ... + 326582.

It is an arithmetic number, because the mean of its divisors is an integer number (34513500).

Almost surely, 2^1681173732 is an apocalyptic number.

1681173732 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1681173732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2484972000).

1681173732 is an abundant number, since it is smaller than the sum of its proper divisors (3288770268).

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

1681173732 is a wasteful number, since it uses less digits than its factorization.

1681173732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5258 (or 5249 counting only the distinct ones).

The product of its digits is 42336, while the sum is 39.

The square root of 1681173732 is about 41002.1186281880. The cubic root of 1681173732 is about 1189.0611741758.

The spelling of 1681173732 in words is "one billion, six hundred eighty-one million, one hundred seventy-three thousand, seven hundred thirty-two".