1216872723 has 16 divisors (see below), whose sum is σ = 1807658496. Its totient is φ = 721806240.

The previous prime is 1216872677. The next prime is 1216872757. The reversal of 1216872723 is 3272786121.

It is not a de Polignac number, because 1216872723 - 2⁹ = 1216872211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216872793) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 390736 + ... + 393837.

It is an arithmetic number, because the mean of its divisors is an integer number (112978656).

Almost surely, 2^1216872723 is an apocalyptic number.

1216872723 is a deficient number, since it is larger than the sum of its proper divisors (590785773).

1216872723 is a wasteful number, since it uses less digits than its factorization.

1216872723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784634.

The product of its digits is 56448, while the sum is 39.

The square root of 1216872723 is about 34883.7028281116. The cubic root of 1216872723 is about 1067.6159466153.

The spelling of 1216872723 in words is "one billion, two hundred sixteen million, eight hundred seventy-two thousand, seven hundred twenty-three".