1187720424 has 96 divisors (see below), whose sum is σ = 3604105440. Its totient is φ = 350179200.

The previous prime is 1187720411. The next prime is 1187720449. The reversal of 1187720424 is 4240277811.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 9039 + ... + 49569.

It is an arithmetic number, because the mean of its divisors is an integer number (37542765).

Almost surely, 2^1187720424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1187720424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1802052720).

1187720424 is an abundant number, since it is smaller than the sum of its proper divisors (2416385016).

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

1187720424 is a wasteful number, since it uses less digits than its factorization.

1187720424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40591 (or 40584 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 1187720424 is about 34463.3199793636. The cubic root of 1187720424 is about 1059.0214132156.

The spelling of 1187720424 in words is "one billion, one hundred eighty-seven million, seven hundred twenty thousand, four hundred twenty-four".