193919812 has 12 divisors (see below), whose sum is σ = 348531820. Its totient is φ = 94339296.

The previous prime is 193919777. The next prime is 193919813. The reversal of 193919812 is 218919391.

It can be written as a sum of positive squares in 2 ways, for example, as 81432576 + 112487236 = 9024^2 + 10606^2 .

It is a super-2 number, since 2×193919812² = 75209786972230688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (193919813) 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, 654987 + ... + 655282.

Almost surely, 2^193919812 is an apocalyptic number.

It is an amenable number.

193919812 is a deficient number, since it is larger than the sum of its proper divisors (154612008).

193919812 is a wasteful number, since it uses less digits than its factorization.

193919812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1310310 (or 1310308 counting only the distinct ones).

The product of its digits is 34992, while the sum is 43.

The square root of 193919812 is about 13925.5093982231. The cubic root of 193919812 is about 578.8162658785.

The spelling of 193919812 in words is "one hundred ninety-three million, nine hundred nineteen thousand, eight hundred twelve".