198470638 has 4 divisors (see below), whose sum is σ = 297705960. Its totient is φ = 99235318.

The previous prime is 198470557. The next prime is 198470639. The reversal of 198470638 is 836074891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 836074891 = 14797 ⋅56503.

It is a super-3 number, since 3×198470638³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198470639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49617658 + ... + 49617661.

It is an arithmetic number, because the mean of its divisors is an integer number (74426490).

Almost surely, 2^198470638 is an apocalyptic number.

198470638 is a deficient number, since it is larger than the sum of its proper divisors (99235322).

198470638 is an equidigital number, since it uses as much as digits as its factorization.

198470638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99235321.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 198470638 is about 14087.9607466801. The cubic root of 198470638 is about 583.3091046989.

The spelling of 198470638 in words is "one hundred ninety-eight million, four hundred seventy thousand, six hundred thirty-eight".