1161635240 has 64 divisors (see below), whose sum is σ = 2732175360. Its totient is φ = 443660800.

The previous prime is 1161635227. The next prime is 1161635257. The reversal of 1161635240 is 425361611.

It is a happy 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, 1008665 + ... + 1009815.

It is an arithmetic number, because the mean of its divisors is an integer number (42690240).

Almost surely, 2^1161635240 is an apocalyptic number.

1161635240 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 1161635240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1366087680).

1161635240 is an abundant number, since it is smaller than the sum of its proper divisors (1570540120).

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

1161635240 is a wasteful number, since it uses less digits than its factorization.

1161635240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2282 (or 2278 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1161635240 is about 34082.7704272995. The cubic root of 1161635240 is about 1051.2110712438.

Adding to 1161635240 its reverse (425361611), we get a palindrome (1586996851).

The spelling of 1161635240 in words is "one billion, one hundred sixty-one million, six hundred thirty-five thousand, two hundred forty".