197885428 has 12 divisors (see below), whose sum is σ = 372938020. Its totient is φ = 91331712.

The previous prime is 197885383. The next prime is 197885447. The reversal of 197885428 is 824588791.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 24383844 + 173501584 = 4938^2 + 13172^2 .

It is a super-2 number, since 2×197885428² = 78317285229486368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52), and also a Moran number because the ratio is a prime number: 3805489 = 197885428 / (1 + 9 + 7 + 8 + 8 + 5 + 4 + 2 + 8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1902693 + ... + 1902796.

Almost surely, 2^197885428 is an apocalyptic number.

It is an amenable number.

197885428 is a deficient number, since it is larger than the sum of its proper divisors (175052592).

197885428 is a wasteful number, since it uses less digits than its factorization.

197885428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3805506 (or 3805504 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 52.

The square root of 197885428 is about 14067.1755516166. The cubic root of 197885428 is about 582.7352257199.

The spelling of 197885428 in words is "one hundred ninety-seven million, eight hundred eighty-five thousand, four hundred twenty-eight".