197987440 has 120 divisors (see below), whose sum is σ = 567164592. Its totient is φ = 63866880.

The previous prime is 197987417. The next prime is 197987477. The reversal of 197987440 is 44789791.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 65155 + ... + 68125.

Almost surely, 2^197987440 is an apocalyptic number.

197987440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 197987440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283582296).

197987440 is an abundant number, since it is smaller than the sum of its proper divisors (369177152).

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

197987440 is a wasteful number, since it uses less digits than its factorization.

197987440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3015 (or 3002 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 197987440 is about 14070.8009722261. The cubic root of 197987440 is about 582.8353438782.

The spelling of 197987440 in words is "one hundred ninety-seven million, nine hundred eighty-seven thousand, four hundred forty".