1981526 has 8 divisors (see below), whose sum is σ = 3041544. Its totient is φ = 967680.

The previous prime is 1981523. The next prime is 1981543. The reversal of 1981526 is 6251891.

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

It is a junction number, because it is equal to n+sod(n) for n = 1981492 and 1981501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11435 + ... + 11606.

It is an arithmetic number, because the mean of its divisors is an integer number (380193).

2^1981526 is an apocalyptic number.

1981526 is a deficient number, since it is larger than the sum of its proper divisors (1060018).

1981526 is a wasteful number, since it uses less digits than its factorization.

1981526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23086.

The product of its digits is 4320, while the sum is 32.

The square root of 1981526 is about 1407.6668639987. Note that the first 3 decimals coincide. The cubic root of 1981526 is about 125.6029746953.

The spelling of 1981526 in words is "one million, nine hundred eighty-one thousand, five hundred twenty-six".