193218690 has 64 divisors (see below), whose sum is σ = 537477120. Its totient is φ = 43538880.

The previous prime is 193218671. The next prime is 193218703. The reversal of 193218690 is 96812391.

It is a super-2 number, since 2×193218690² = 74666924330632200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8431 + ... + 21389.

It is an arithmetic number, because the mean of its divisors is an integer number (8398080).

Almost surely, 2^193218690 is an apocalyptic number.

193218690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 193218690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268738560).

193218690 is an abundant number, since it is smaller than the sum of its proper divisors (344258430).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

193218690 is a wasteful number, since it uses less digits than its factorization.

193218690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13047.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 193218690 is about 13900.3125864133. The cubic root of 193218690 is about 578.1178485212.

The spelling of 193218690 in words is "one hundred ninety-three million, two hundred eighteen thousand, six hundred ninety".