194220407 has 4 divisors (see below), whose sum is σ = 194331120. Its totient is φ = 194109696.

The previous prime is 194220371. The next prime is 194220419. The reversal of 194220407 is 704022491.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 194220407 - 2⁶ = 194220343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 194220407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194220707) 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, 52682 + ... + 56247.

It is an arithmetic number, because the mean of its divisors is an integer number (48582780).

Almost surely, 2^194220407 is an apocalyptic number.

194220407 is a deficient number, since it is larger than the sum of its proper divisors (110713).

194220407 is a wasteful number, since it uses less digits than its factorization.

194220407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110712.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 194220407 is about 13936.2981813680. The cubic root of 194220407 is about 579.1151857444.

Adding to 194220407 its reverse (704022491), we get a palindrome (898242898).

The spelling of 194220407 in words is "one hundred ninety-four million, two hundred twenty thousand, four hundred seven".