1189620040 has 128 divisors (see below), whose sum is σ = 3223296000. Its totient is φ = 394571520.

The previous prime is 1189619957. The next prime is 1189620083. The reversal of 1189620040 is 400269811.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 1189619984 and 1189620011.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 423922 + ... + 426718.

It is an arithmetic number, because the mean of its divisors is an integer number (25182000).

Almost surely, 2^1189620040 is an apocalyptic number.

1189620040 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 1189620040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1611648000).

1189620040 is an abundant number, since it is smaller than the sum of its proper divisors (2033675960).

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

1189620040 is a wasteful number, since it uses less digits than its factorization.

1189620040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2860 (or 2842 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 1189620040 is about 34490.8689365751. The cubic root of 1189620040 is about 1059.5857049527.

Adding to 1189620040 its reverse (400269811), we get a palindrome (1589889851).

The spelling of 1189620040 in words is "one billion, one hundred eighty-nine million, six hundred twenty thousand, forty".