1423778836 has 12 divisors (see below), whose sum is σ = 2501953300. Its totient is φ = 708935040.

The previous prime is 1423778801. The next prime is 1423778879. The reversal of 1423778836 is 6388773241.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 983198736 + 440580100 = 31356^2 + 20990^2 .

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1423778836.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 737511 + ... + 739438.

Almost surely, 2^1423778836 is an apocalyptic number.

It is an amenable number.

1423778836 is a deficient number, since it is larger than the sum of its proper divisors (1078174464).

1423778836 is a wasteful number, since it uses less digits than its factorization.

1423778836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1477194 (or 1477192 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 49.

The square root of 1423778836 is about 37732.9939972963. The cubic root of 1423778836 is about 1124.9870183852.

The spelling of 1423778836 in words is "one billion, four hundred twenty-three million, seven hundred seventy-eight thousand, eight hundred thirty-six".