193920215 has 4 divisors (see below), whose sum is σ = 232704264. Its totient is φ = 155136168.

The previous prime is 193920211. The next prime is 193920257. The reversal of 193920215 is 512029391.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 512029391 = 683 ⋅749677.

It is a cyclic number.

It is not a de Polignac number, because 193920215 - 2² = 193920211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (193920211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19392017 + ... + 19392026.

It is an arithmetic number, because the mean of its divisors is an integer number (58176066).

Almost surely, 2^193920215 is an apocalyptic number.

193920215 is a deficient number, since it is larger than the sum of its proper divisors (38784049).

193920215 is an equidigital number, since it uses as much as digits as its factorization.

193920215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38784048.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 193920215 is about 13925.5238680633. The cubic root of 193920215 is about 578.8166668394.

The spelling of 193920215 in words is "one hundred ninety-three million, nine hundred twenty thousand, two hundred fifteen".