197449890 has 32 divisors (see below), whose sum is σ = 516960576. Its totient is φ = 47866560.

The previous prime is 197449859. The next prime is 197449897. The reversal of 197449890 is 98944791.

It is a super-2 number, since 2×197449890² = 77972918122024200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (197449897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 298837 + ... + 299496.

It is an arithmetic number, because the mean of its divisors is an integer number (16155018).

Almost surely, 2^197449890 is an apocalyptic number.

197449890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

197449890 is an abundant number, since it is smaller than the sum of its proper divisors (319510686).

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

197449890 is a wasteful number, since it uses less digits than its factorization.

197449890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598354.

The product of its (nonzero) digits is 653184, while the sum is 51.

The square root of 197449890 is about 14051.6863756632. The cubic root of 197449890 is about 582.3073859526.

The spelling of 197449890 in words is "one hundred ninety-seven million, four hundred forty-nine thousand, eight hundred ninety".