196557840 has 120 divisors (see below), whose sum is σ = 684622848. Its totient is φ = 52410240.

The previous prime is 196557827. The next prime is 196557871. The reversal of 196557840 is 48755691.

196557840 is a `hidden beast` number, since 1 + 96 + 557 + 8 + 4 + 0 = 666.

196557840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14385 + ... + 24495.

Almost surely, 2^196557840 is an apocalyptic number.

196557840 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 196557840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (342311424).

196557840 is an abundant number, since it is smaller than the sum of its proper divisors (488065008).

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

196557840 is a wasteful number, since it uses less digits than its factorization.

196557840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10139 (or 10121 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The square root of 196557840 is about 14019.9087015572. The cubic root of 196557840 is about 581.4291352134.

It can be divided in two parts, 19655 and 7840, that added together give a triangular number (27495 = T₂₃₄).

The spelling of 196557840 in words is "one hundred ninety-six million, five hundred fifty-seven thousand, eight hundred forty".