1161421740 has 240 divisors, whose sum is σ = 3884680800. Its totient is φ = 289640448.

The previous prime is 1161421669. The next prime is 1161421753. The reversal of 1161421740 is 471241611.

1161421740 is a `hidden beast` number, since 1 + 1 + 614 + 2 + 1 + 7 + 40 = 666.

1161421740 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2985466 + ... + 2985854.

It is an arithmetic number, because the mean of its divisors is an integer number (16186170).

Almost surely, 2^1161421740 is an apocalyptic number.

1161421740 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 1161421740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1942340400).

1161421740 is an abundant number, since it is smaller than the sum of its proper divisors (2723259060).

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

1161421740 is a wasteful number, since it uses less digits than its factorization.

1161421740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 1161421740 is about 34079.6382023049. The cubic root of 1161421740 is about 1051.1466656809.

The spelling of 1161421740 in words is "one billion, one hundred sixty-one million, four hundred twenty-one thousand, seven hundred forty".