197681440 has 96 divisors (see below), whose sum is σ = 539529984. Its totient is φ = 67645440.

The previous prime is 197681437. The next prime is 197681461. The reversal of 197681440 is 44186791.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 197681393 and 197681402.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26617 + ... + 33223.

It is an arithmetic number, because the mean of its divisors is an integer number (5620104).

Almost surely, 2^197681440 is an apocalyptic number.

197681440 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 197681440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269764992).

197681440 is an abundant number, since it is smaller than the sum of its proper divisors (341848544).

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

197681440 is a wasteful number, since it uses less digits than its factorization.

197681440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6650 (or 6642 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 197681440 is about 14059.9231861344. The cubic root of 197681440 is about 582.5349214943.

The spelling of 197681440 in words is "one hundred ninety-seven million, six hundred eighty-one thousand, four hundred forty".