1681987274 has 32 divisors (see below), whose sum is σ = 2990684160. Its totient is φ = 700930800.

The previous prime is 1681987271. The next prime is 1681987297. The reversal of 1681987274 is 4727891861.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1681987271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51944 + ... + 77859.

It is an arithmetic number, because the mean of its divisors is an integer number (93458880).

Almost surely, 2^1681987274 is an apocalyptic number.

1681987274 is a deficient number, since it is larger than the sum of its proper divisors (1308696886).

1681987274 is a wasteful number, since it uses less digits than its factorization.

1681987274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129866.

The product of its digits is 1354752, while the sum is 53.

The square root of 1681987274 is about 41012.0381595453. The cubic root of 1681987274 is about 1189.2529440073.

The spelling of 1681987274 in words is "one billion, six hundred eighty-one million, nine hundred eighty-seven thousand, two hundred seventy-four".