1944194309 has 4 divisors (see below), whose sum is σ = 1957069920. Its totient is φ = 1931318700.

The previous prime is 1944194299. The next prime is 1944194311. The reversal of 1944194309 is 9034914491.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1944194309 is a prime.

It is a super-2 number, since 2×1944194309² = 7559783022295974962, which contains 22 as substring.

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 1944194309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1944194009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6437579 + ... + 6437880.

It is an arithmetic number, because the mean of its divisors is an integer number (489267480).

Almost surely, 2^1944194309 is an apocalyptic number.

It is an amenable number.

1944194309 is a deficient number, since it is larger than the sum of its proper divisors (12875611).

1944194309 is a wasteful number, since it uses less digits than its factorization.

1944194309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12875610.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 1944194309 is about 44093.0188238456. The cubic root of 1944194309 is about 1248.0918746482.

The spelling of 1944194309 in words is "one billion, nine hundred forty-four million, one hundred ninety-four thousand, three hundred nine".