194120389 has 16 divisors (see below), whose sum is σ = 203315200. Its totient is φ = 185177664.

The previous prime is 194120383. The next prime is 194120393. The reversal of 194120389 is 983021491.

It is a 3-Lehmer number, since φ(194120389) divides (194120389-1)³.

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 194120389 - 2⁷ = 194120261 is a prime.

It is a super-2 number, since 2×194120389² = 75365450851022642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a deceptive number, since it divides R_194120388.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194120383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 512002 + ... + 512380.

It is an arithmetic number, because the mean of its divisors is an integer number (12707200).

It is a Poulet number, since it divides 2^194120388-1.

Almost surely, 2^194120389 is an apocalyptic number.

It is an amenable number.

194120389 is a deficient number, since it is larger than the sum of its proper divisors (9194811).

194120389 is a wasteful number, since it uses less digits than its factorization.

194120389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 194120389 is about 13932.7093201574. The cubic root of 194120389 is about 579.0157593777.

The spelling of 194120389 in words is "one hundred ninety-four million, one hundred twenty thousand, three hundred eighty-nine".