1278890 has 32 divisors (see below), whose sum is σ = 2488320. Its totient is φ = 471744.

The previous prime is 1278881. The next prime is 1278899. The reversal of 1278890 is 988721.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1278881) and next prime (1278899).

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1278890.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10007 + ... + 10133.

It is an arithmetic number, because the mean of its divisors is an integer number (77760).

2^1278890 is an apocalyptic number.

1278890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1278890 is a deficient number, since it is larger than the sum of its proper divisors (1209430).

1278890 is a wasteful number, since it uses less digits than its factorization.

1278890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 1278890 is about 1130.8801881720. The cubic root of 1278890 is about 108.5453101334.

The spelling of 1278890 in words is "one million, two hundred seventy-eight thousand, eight hundred ninety".