1936972009 has 6 divisors (see below), whose sum is σ = 2253212394. Its totient is φ = 1660261680.

The previous prime is 1936972003. The next prime is 1936972013. The reversal of 1936972009 is 9002796391.

It can be written as a sum of positive squares in only one way, i.e., 990486784 + 946485225 = 31472^2 + 30765^2 .

It is not a de Polignac number, because 1936972009 - 2³ = 1936972001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1936972009.

It is not an unprimeable number, because it can be changed into a prime (1936972001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19764972 + ... + 19765069.

It is an arithmetic number, because the mean of its divisors is an integer number (375535399).

Almost surely, 2^1936972009 is an apocalyptic number.

It is an amenable number.

1936972009 is a deficient number, since it is larger than the sum of its proper divisors (316240385).

1936972009 is an equidigital number, since it uses as much as digits as its factorization.

1936972009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39530055 (or 39530048 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 46.

The square root of 1936972009 is about 44011.0441707533. The cubic root of 1936972009 is about 1246.5444849214.

It can be divided in two parts, 19369 and 72009, that added together give a triangular number (91378 = T₄₂₇).

The spelling of 1936972009 in words is "one billion, nine hundred thirty-six million, nine hundred seventy-two thousand, nine".