1422257778 has 30 divisors (see below), whose sum is σ = 3187986879. Its totient is φ = 473925924.

The previous prime is 1422257731. The next prime is 1422257779. The reversal of 1422257778 is 8777522241.

1422257778 is a `hidden beast` number, since 1 + 4 + 2 + 2 + 2 + 577 + 78 = 666.

It can be written as a sum of positive squares in only one way, i.e., 711128889 + 711128889 = 26667^2 + 26667^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=26667.

It is a super-3 number, since 3×1422257778³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1422257779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 478525 + ... + 481487.

Almost surely, 2^1422257778 is an apocalyptic number.

1422257778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1422257778 is an abundant number, since it is smaller than the sum of its proper divisors (1765729101).

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

1422257778 is an frugal number, since it uses more digits than its factorization.

1422257778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5940 (or 2968 counting only the distinct ones).

The product of its digits is 439040, while the sum is 45.

The square root of 1422257778 is about 37712.8330678033. The cubic root of 1422257778 is about 1124.5862585235.

The spelling of 1422257778 in words is "one billion, four hundred twenty-two million, two hundred fifty-seven thousand, seven hundred seventy-eight".