1209716816 has 40 divisors (see below), whose sum is σ = 2922176064. Its totient is φ = 471317760.

The previous prime is 1209716657. The next prime is 1209716819. The reversal of 1209716816 is 6186179021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209716819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 489725 + ... + 492188.

Almost surely, 2^1209716816 is an apocalyptic number.

1209716816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1209716816 is an abundant number, since it is smaller than the sum of its proper divisors (1712459248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1209716816 is a wasteful number, since it uses less digits than its factorization.

1209716816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981939 (or 981933 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 1209716816 is about 34780.9835398598. The cubic root of 1209716816 is about 1065.5191003898.

The spelling of 1209716816 in words is "one billion, two hundred nine million, seven hundred sixteen thousand, eight hundred sixteen".