1681739194 has 24 divisors (see below), whose sum is σ = 2584028160. Its totient is φ = 820762272.

The previous prime is 1681739167. The next prime is 1681739201. The reversal of 1681739194 is 4919371861.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1314247 + ... + 1315525.

It is an arithmetic number, because the mean of its divisors is an integer number (107667840).

Almost surely, 2^1681739194 is an apocalyptic number.

1681739194 is a deficient number, since it is larger than the sum of its proper divisors (902288966).

1681739194 is an equidigital number, since it uses as much as digits as its factorization.

1681739194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1542 (or 1453 counting only the distinct ones).

The product of its digits is 326592, while the sum is 49.

The square root of 1681739194 is about 41009.0135701897. The cubic root of 1681739194 is about 1189.1944726223.

The spelling of 1681739194 in words is "one billion, six hundred eighty-one million, seven hundred thirty-nine thousand, one hundred ninety-four".