1279890 has 24 divisors (see below), whose sum is σ = 3327948. Its totient is φ = 341280.

The previous prime is 1279877. The next prime is 1279907. The reversal of 1279890 is 989721.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1279161 + 729 = 1131^2 + 27^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7021 + ... + 7200.

2^1279890 is an apocalyptic number.

1279890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1279890 is an abundant number, since it is smaller than the sum of its proper divisors (2048058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1279890 is a wasteful number, since it uses less digits than its factorization.

1279890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14234 (or 14231 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 1279890 is about 1131.3222352628. The cubic root of 1279890 is about 108.5735943045.

The spelling of 1279890 in words is "one million, two hundred seventy-nine thousand, eight hundred ninety".