193940431 has 4 divisors (see below), whose sum is σ = 195656832. Its totient is φ = 192224032.

The previous prime is 193940423. The next prime is 193940441. The reversal of 193940431 is 134049391.

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 193940431 - 2³ = 193940423 is a prime.

It is a super-2 number, since 2×193940431² = 75225781552931522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (193940441) 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, 858031 + ... + 858256.

It is an arithmetic number, because the mean of its divisors is an integer number (48914208).

Almost surely, 2^193940431 is an apocalyptic number.

193940431 is a deficient number, since it is larger than the sum of its proper divisors (1716401).

193940431 is a wasteful number, since it uses less digits than its factorization.

193940431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1716400.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 193940431 is about 13926.2497105287. The cubic root of 193940431 is about 578.8367798382.

Subtracting from 193940431 its reverse (134049391), we obtain a triangular number (59891040 = T₁₀₉₄₄).

The spelling of 193940431 in words is "one hundred ninety-three million, nine hundred forty thousand, four hundred thirty-one".