1426778 has 4 divisors (see below), whose sum is σ = 2140170. Its totient is φ = 713388.

The previous prime is 1426753. The next prime is 1426781. The reversal of 1426778 is 8776241.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8776241 = 29 ⋅302629.

It can be written as a sum of positive squares in only one way, i.e., 1261129 + 165649 = 1123^2 + 407^2 .

It is a super-2 number, since 2×1426778² = 4071390922568, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 356693 + ... + 356696.

2^1426778 is an apocalyptic number.

1426778 is a deficient number, since it is larger than the sum of its proper divisors (713392).

1426778 is an equidigital number, since it uses as much as digits as its factorization.

1426778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713391.

The product of its digits is 18816, while the sum is 35.

The square root of 1426778 is about 1194.4781287240. The cubic root of 1426778 is about 112.5776385887.

The spelling of 1426778 in words is "one million, four hundred twenty-six thousand, seven hundred seventy-eight".