1945217694 has 64 divisors (see below), whose sum is σ = 4564611072. Its totient is φ = 541036800.

The previous prime is 1945217693. The next prime is 1945217699. The reversal of 1945217694 is 4967125491.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1945217693) 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 31 ways as a sum of consecutive naturals, for example, 1044324 + ... + 1046184.

It is an arithmetic number, because the mean of its divisors is an integer number (71322048).

Almost surely, 2^1945217694 is an apocalyptic number.

1945217694 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1945217694, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2282305536).

1945217694 is an abundant number, since it is smaller than the sum of its proper divisors (2619393378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1945217694 is a wasteful number, since it uses less digits than its factorization.

1945217694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2521.

The product of its digits is 544320, while the sum is 48.

The square root of 1945217694 is about 44104.6221387283. The cubic root of 1945217694 is about 1248.3108264357.

The spelling of 1945217694 in words is "one billion, nine hundred forty-five million, two hundred seventeen thousand, six hundred ninety-four".