1981695 has 8 divisors (see below), whose sum is σ = 3170736. Its totient is φ = 1056896.

The previous prime is 1981691. The next prime is 1981699. The reversal of 1981695 is 5961891.

It is an interprime number because it is at equal distance from previous prime (1981691) and next prime (1981699).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1981695 - 2² = 1981691 is a prime.

1981695 is a lucky number.

It is a zygodrome in base 2.

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 7 ways as a sum of consecutive naturals, for example, 66042 + ... + 66071.

It is an arithmetic number, because the mean of its divisors is an integer number (396342).

2^1981695 is an apocalyptic number.

1981695 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1981695 is a deficient number, since it is larger than the sum of its proper divisors (1189041).

1981695 is a wasteful number, since it uses less digits than its factorization.

1981695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132121.

The product of its digits is 19440, while the sum is 39.

The square root of 1981695 is about 1407.7268911263. The cubic root of 1981695 is about 125.6065453944.

The spelling of 1981695 in words is "one million, nine hundred eighty-one thousand, six hundred ninety-five".