1273371816 has 64 divisors (see below), whose sum is σ = 3326313600. Its totient is φ = 405456128.

The previous prime is 1273371787. The next prime is 1273371823. The reversal of 1273371816 is 6181733721.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 677470 + ... + 679346.

It is an arithmetic number, because the mean of its divisors is an integer number (51973650).

Almost surely, 2^1273371816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1273371816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1663156800).

1273371816 is an abundant number, since it is smaller than the sum of its proper divisors (2052941784).

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

1273371816 is a wasteful number, since it uses less digits than its factorization.

1273371816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3138 (or 3134 counting only the distinct ones).

The product of its digits is 42336, while the sum is 39.

The square root of 1273371816 is about 35684.3357231153. The cubic root of 1273371816 is about 1083.8896711920.

The spelling of 1273371816 in words is "one billion, two hundred seventy-three million, three hundred seventy-one thousand, eight hundred sixteen".