1185978240 has 128 divisors (see below), whose sum is σ = 4200400800. Its totient is φ = 316256256.

The previous prime is 1185978223. The next prime is 1185978289. The reversal of 1185978240 is 428795811.

1185978240 is a `hidden beast` number, since 1 + 18 + 597 + 8 + 2 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

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

It is a congruent number.

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, 17037 + ... + 51596.

Almost surely, 2^1185978240 is an apocalyptic number.

1185978240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1185978240 is an abundant number, since it is smaller than the sum of its proper divisors (3014422560).

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

1185978240 is an equidigital number, since it uses as much as digits as its factorization.

1185978240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68661 (or 68643 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The square root of 1185978240 is about 34438.0347871362. The cubic root of 1185978240 is about 1058.5033583586.

The spelling of 1185978240 in words is "one billion, one hundred eighty-five million, nine hundred seventy-eight thousand, two hundred forty".