1423778 has 4 divisors (see below), whose sum is σ = 2135670. Its totient is φ = 711888.

The previous prime is 1423759. The next prime is 1423781. The reversal of 1423778 is 8773241.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1423249 + 529 = 1193^2 + 23^2 .

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, 355943 + ... + 355946.

2^1423778 is an apocalyptic number.

1423778 is a deficient number, since it is larger than the sum of its proper divisors (711892).

1423778 is an equidigital number, since it uses as much as digits as its factorization.

1423778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711891.

The product of its digits is 9408, while the sum is 32.

The square root of 1423778 is about 1193.2216893771. The cubic root of 1423778 is about 112.4986798199.

The spelling of 1423778 in words is "one million, four hundred twenty-three thousand, seven hundred seventy-eight".