193981406 has 8 divisors (see below), whose sum is σ = 301005720. Its totient is φ = 93646168.

The previous prime is 193981397. The next prime is 193981423. The reversal of 193981406 is 604189391.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1672196 + ... + 1672311.

It is an arithmetic number, because the mean of its divisors is an integer number (37625715).

Almost surely, 2^193981406 is an apocalyptic number.

193981406 is a deficient number, since it is larger than the sum of its proper divisors (107024314).

193981406 is a wasteful number, since it uses less digits than its factorization.

193981406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3344538.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 193981406 is about 13927.7207754894. The cubic root of 193981406 is about 578.8775417821.

The spelling of 193981406 in words is "one hundred ninety-three million, nine hundred eighty-one thousand, four hundred six".