1981694 has 32 divisors (see below), whose sum is σ = 3598560. Its totient is φ = 811200.

The previous prime is 1981691. The next prime is 1981699. The reversal of 1981694 is 4961891.

It is a happy number.

It is a super-2 number, since 2×1981694² = 7854222219272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981691) 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, 48314 + ... + 48354.

It is an arithmetic number, because the mean of its divisors is an integer number (112455).

2^1981694 is an apocalyptic number.

1981694 is a deficient number, since it is larger than the sum of its proper divisors (1616866).

1981694 is a wasteful number, since it uses less digits than its factorization.

1981694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 67 counting only the distinct ones).

The product of its digits is 15552, while the sum is 38.

The square root of 1981694 is about 1407.7265359437. The cubic root of 1981694 is about 125.6065242666.

The spelling of 1981694 in words is "one million, nine hundred eighty-one thousand, six hundred ninety-four".