197639442 has 144 divisors (see below), whose sum is σ = 585591552. Its totient is φ = 47355840.

The previous prime is 197639423. The next prime is 197639443. The reversal of 197639442 is 244936791.

It is a happy number.

197639442 is a `hidden beast` number, since 1 + 9 + 7 + 639 + 4 + 4 + 2 = 666.

It is a super-2 number, since 2×197639442² = 78122698068142728, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197639443) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 125343 + ... + 126909.

It is an arithmetic number, because the mean of its divisors is an integer number (4066608).

Almost surely, 2^197639442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 197639442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292795776).

197639442 is an abundant number, since it is smaller than the sum of its proper divisors (387952110).

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

197639442 is a wasteful number, since it uses less digits than its factorization.

197639442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613 (or 1603 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 197639442 is about 14058.4295709016. The cubic root of 197639442 is about 582.4936648233.

The spelling of 197639442 in words is "one hundred ninety-seven million, six hundred thirty-nine thousand, four hundred forty-two".