1278490 has 8 divisors (see below), whose sum is σ = 2301300. Its totient is φ = 511392.

The previous prime is 1278481. The next prime is 1278493. The reversal of 1278490 is 948721.

It can be written as a sum of positive squares in 2 ways, for example, as 1190281 + 88209 = 1091^2 + 297^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1278493) 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, 63915 + ... + 63934.

2^1278490 is an apocalyptic number.

1278490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1278490 is a deficient number, since it is larger than the sum of its proper divisors (1022810).

1278490 is a wasteful number, since it uses less digits than its factorization.

1278490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127856.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 1278490 is about 1130.7033209467. The cubic root of 1278490 is about 108.5339923366.

The spelling of 1278490 in words is "one million, two hundred seventy-eight thousand, four hundred ninety".