1280998 has 4 divisors (see below), whose sum is σ = 1921500. Its totient is φ = 640498.

The previous prime is 1280989. The next prime is 1281029. The reversal of 1280998 is 8990821.

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

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320248 + ... + 320251.

It is an arithmetic number, because the mean of its divisors is an integer number (480375).

2^1280998 is an apocalyptic number.

1280998 is a deficient number, since it is larger than the sum of its proper divisors (640502).

1280998 is an equidigital number, since it uses as much as digits as its factorization.

1280998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640501.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 1280998 is about 1131.8118218149. The cubic root of 1280998 is about 108.6049159662.

It can be divided in two parts, 1280 and 998, that added together give a triangular number (2278 = T₆₇).

The spelling of 1280998 in words is "one million, two hundred eighty thousand, nine hundred ninety-eight".