1693693638 has 80 divisors (see below), whose sum is σ = 4670967840. Its totient is φ = 446684544.

The previous prime is 1693693633. The next prime is 1693693657. The reversal of 1693693638 is 8363963961.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1693693633) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 42703 + ... + 72186.

It is an arithmetic number, because the mean of its divisors is an integer number (58387098).

Almost surely, 2^1693693638 is an apocalyptic number.

1693693638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1693693638 is an abundant number, since it is smaller than the sum of its proper divisors (2977274202).

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

1693693638 is a wasteful number, since it uses less digits than its factorization.

1693693638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114923 (or 114914 counting only the distinct ones).

The product of its digits is 3779136, while the sum is 54.

The square root of 1693693638 is about 41154.5093276545. The cubic root of 1693693638 is about 1192.0055717012.

The spelling of 1693693638 in words is "one billion, six hundred ninety-three million, six hundred ninety-three thousand, six hundred thirty-eight".