1693691945 has 8 divisors (see below), whose sum is σ = 2217196800. Its totient is φ = 1231775920.

The previous prime is 1693691921. The next prime is 1693691947. The reversal of 1693691945 is 5491963961.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1693691945 - 2⁸ = 1693691689 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1693691947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15397145 + ... + 15397254.

It is an arithmetic number, because the mean of its divisors is an integer number (277149600).

Almost surely, 2^1693691945 is an apocalyptic number.

It is an amenable number.

1693691945 is a deficient number, since it is larger than the sum of its proper divisors (523504855).

1693691945 is a wasteful number, since it uses less digits than its factorization.

1693691945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30794415.

The product of its digits is 1574640, while the sum is 53.

The square root of 1693691945 is about 41154.4887588219. The cubic root of 1693691945 is about 1192.0051745286.

The spelling of 1693691945 in words is "one billion, six hundred ninety-three million, six hundred ninety-one thousand, nine hundred forty-five".