1426287778 has 4 divisors (see below), whose sum is σ = 2139431670. Its totient is φ = 713143888.

The previous prime is 1426287739. The next prime is 1426287817. The reversal of 1426287778 is 8777826241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8777826241 = 401 ⋅21889841.

It is an interprime number because it is at equal distance from previous prime (1426287739) and next prime (1426287817).

It can be written as a sum of positive squares in only one way, i.e., 1065173769 + 361114009 = 32637^2 + 19003^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 356571943 + ... + 356571946.

Almost surely, 2^1426287778 is an apocalyptic number.

1426287778 is a deficient number, since it is larger than the sum of its proper divisors (713143892).

1426287778 is an equidigital number, since it uses as much as digits as its factorization.

1426287778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713143891.

The product of its digits is 2107392, while the sum is 52.

The square root of 1426287778 is about 37766.2253607638. The cubic root of 1426287778 is about 1125.6474371722.

The spelling of 1426287778 in words is "one billion, four hundred twenty-six million, two hundred eighty-seven thousand, seven hundred seventy-eight".