1693942638 has 8 divisors (see below), whose sum is σ = 3387885288. Its totient is φ = 564647544.

The previous prime is 1693942603. The next prime is 1693942639. The reversal of 1693942638 is 8362493961.

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

1693942638 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1693942639) 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, 141161881 + ... + 141161892.

It is an arithmetic number, because the mean of its divisors is an integer number (423485661).

Almost surely, 2^1693942638 is an apocalyptic number.

1693942638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1693942638 is a wasteful number, since it uses less digits than its factorization.

1693942638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282323778.

The product of its digits is 1679616, while the sum is 51.

The square root of 1693942638 is about 41157.5344013705. The cubic root of 1693942638 is about 1192.0639834542.

The spelling of 1693942638 in words is "one billion, six hundred ninety-three million, nine hundred forty-two thousand, six hundred thirty-eight".