1780972994 has 4 divisors (see below), whose sum is σ = 2671459494. Its totient is φ = 890486496.

The previous prime is 1780972993. The next prime is 1780973009. The reversal of 1780972994 is 4992790871.

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., 1752510769 + 28462225 = 41863^2 + 5335^2 .

It is not an unprimeable number, because it can be changed into a prime (1780972993) 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 as a sum of consecutive naturals, namely, 445243247 + ... + 445243250.

Almost surely, 2^1780972994 is an apocalyptic number.

1780972994 is a deficient number, since it is larger than the sum of its proper divisors (890486500).

1780972994 is an equidigital number, since it uses as much as digits as its factorization.

1780972994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890486499.

The product of its (nonzero) digits is 2286144, while the sum is 56.

The square root of 1780972994 is about 42201.5757288753. The cubic root of 1780972994 is about 1212.1390558319.

The spelling of 1780972994 in words is "one billion, seven hundred eighty million, nine hundred seventy-two thousand, nine hundred ninety-four".