1281898 has 4 divisors (see below), whose sum is σ = 1922850. Its totient is φ = 640948.

The previous prime is 1281883. The next prime is 1281899. The reversal of 1281898 is 8981821.

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

It can be written as a sum of positive squares in only one way, i.e., 815409 + 466489 = 903^2 + 683^2 .

It is not an unprimeable number, because it can be changed into a prime (1281899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320473 + ... + 320476.

2^1281898 is an apocalyptic number.

1281898 is a deficient number, since it is larger than the sum of its proper divisors (640952).

1281898 is an equidigital number, since it uses as much as digits as its factorization.

1281898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640951.

The product of its digits is 9216, while the sum is 37.

The square root of 1281898 is about 1132.2093446002. The cubic root of 1281898 is about 108.6303444582.

The spelling of 1281898 in words is "one million, two hundred eighty-one thousand, eight hundred ninety-eight".