161040236 has 48 divisors (see below), whose sum is σ = 333312000. Its totient is φ = 66650688.

The previous prime is 161040233. The next prime is 161040239. The reversal of 161040236 is 632040161.

It is a happy number.

161040236 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161040233) and next prime (161040239).

It is a super-2 number, since 2×161040236² = 51867915221871392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161040233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103190 + ... + 104738.

It is an arithmetic number, because the mean of its divisors is an integer number (6944000).

Almost surely, 2^161040236 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 161040236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166656000).

161040236 is an abundant number, since it is smaller than the sum of its proper divisors (172271764).

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

161040236 is a wasteful number, since it uses less digits than its factorization.

161040236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686 (or 1684 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 161040236 is about 12690.1629619166. The cubic root of 161040236 is about 544.0574973468.

Adding to 161040236 its reverse (632040161), we get a palindrome (793080397).

The spelling of 161040236 in words is "one hundred sixty-one million, forty thousand, two hundred thirty-six".