1372740209 has 2 divisors, whose sum is σ = 1372740210. Its totient is φ = 1372740208.

The previous prime is 1372740179. The next prime is 1372740221. The reversal of 1372740209 is 9020472731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1137577984 + 235162225 = 33728^2 + 15335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1372740209 is a prime.

It is not a weakly prime, because it can be changed into another prime (1372740409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 686370104 + 686370105.

It is an arithmetic number, because the mean of its divisors is an integer number (686370105).

Almost surely, 2^1372740209 is an apocalyptic number.

It is an amenable number.

1372740209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1372740209 is an equidigital number, since it uses as much as digits as its factorization.

1372740209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 1372740209 is about 37050.5088898925. The cubic root of 1372740209 is about 1111.3805318367.

The spelling of 1372740209 in words is "one billion, three hundred seventy-two million, seven hundred forty thousand, two hundred nine".