1981498 has 8 divisors (see below), whose sum is σ = 3052692. Its totient is φ = 963936.

The previous prime is 1981493. The next prime is 1981513. The reversal of 1981498 is 8941891.

It can be written as a sum of positive squares in 2 ways, for example, as 1979649 + 1849 = 1407^2 + 43^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1981498.

It is not an unprimeable number, because it can be changed into a prime (1981493) 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, 13315 + ... + 13462.

2^1981498 is an apocalyptic number.

1981498 is a deficient number, since it is larger than the sum of its proper divisors (1071194).

1981498 is a wasteful number, since it uses less digits than its factorization.

1981498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26816.

The product of its digits is 20736, while the sum is 40.

The square root of 1981498 is about 1407.6569184286. The cubic root of 1981498 is about 125.6023830805.

The spelling of 1981498 in words is "one million, nine hundred eighty-one thousand, four hundred ninety-eight".