1681927740 has 60 divisors (see below), whose sum is σ = 5276274696. Its totient is φ = 448513632.

The previous prime is 1681927727. The next prime is 1681927763. The reversal of 1681927740 is 477291861.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 517494 + ... + 520733.

Almost surely, 2^1681927740 is an apocalyptic number.

1681927740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1681927740 is an abundant number, since it is smaller than the sum of its proper divisors (3594346956).

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

1681927740 is a wasteful number, since it uses less digits than its factorization.

1681927740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038248 (or 1038237 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 1681927740 is about 41011.3123418405. The cubic root of 1681927740 is about 1189.2389126248.

The spelling of 1681927740 in words is "one billion, six hundred eighty-one million, nine hundred twenty-seven thousand, seven hundred forty".