19531982 has 4 divisors (see below), whose sum is σ = 29297976. Its totient is φ = 9765990.

The previous prime is 19531973. The next prime is 19531987. The reversal of 19531982 is 28913591.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19531987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4882994 + ... + 4882997.

It is an arithmetic number, because the mean of its divisors is an integer number (7324494).

Almost surely, 2^19531982 is an apocalyptic number.

19531982 is a deficient number, since it is larger than the sum of its proper divisors (9765994).

19531982 is an equidigital number, since it uses as much as digits as its factorization.

19531982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9765993.

The product of its digits is 19440, while the sum is 38.

The square root of 19531982 is about 4419.5001979862. The cubic root of 19531982 is about 269.3077005772.

The spelling of 19531982 in words is "nineteen million, five hundred thirty-one thousand, nine hundred eighty-two".