1372726009 has 2 divisors, whose sum is σ = 1372726010. Its totient is φ = 1372726008.

The previous prime is 1372726007. The next prime is 1372726067. The reversal of 1372726009 is 9006272731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1033429609 + 339296400 = 32147^2 + 18420^2 .

It is a cyclic number.

It is not a de Polignac number, because 1372726009 - 2¹ = 1372726007 is a prime.

Together with 1372726007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1372726001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 686363004 + 686363005.

It is an arithmetic number, because the mean of its divisors is an integer number (686363005).

Almost surely, 2^1372726009 is an apocalyptic number.

It is an amenable number.

1372726009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1372726009 is an equidigital number, since it uses as much as digits as its factorization.

1372726009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 1372726009 is about 37050.3172591005. The cubic root of 1372726009 is about 1111.3766996821.

The spelling of 1372726009 in words is "one billion, three hundred seventy-two million, seven hundred twenty-six thousand, nine".