1209782423 has 4 divisors (see below), whose sum is σ = 1212395808. Its totient is φ = 1207169040.

The previous prime is 1209782417. The next prime is 1209782443. The reversal of 1209782423 is 3242879021.

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

It is a cyclic number.

It is not a de Polignac number, because 1209782423 - 2²⁴ = 1193005207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209782443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1305998 + ... + 1306923.

It is an arithmetic number, because the mean of its divisors is an integer number (303098952).

Almost surely, 2^1209782423 is an apocalyptic number.

1209782423 is a deficient number, since it is larger than the sum of its proper divisors (2613385).

1209782423 is an equidigital number, since it uses as much as digits as its factorization.

1209782423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2613384.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 1209782423 is about 34781.9266717645. The cubic root of 1209782423 is about 1065.5383622663.

The spelling of 1209782423 in words is "one billion, two hundred nine million, seven hundred eighty-two thousand, four hundred twenty-three".