12161040 has 40 divisors (see below), whose sum is σ = 37699968. Its totient is φ = 3242880.

The previous prime is 12161029. The next prime is 12161041. The reversal of 12161040 is 4016121.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (12161041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25096 + ... + 25575.

Almost surely, 2^12161040 is an apocalyptic number.

12161040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12161040 is an abundant number, since it is smaller than the sum of its proper divisors (25538928).

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

12161040 is a wasteful number, since it uses less digits than its factorization.

12161040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50687 (or 50681 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 12161040 is about 3487.2682718713. The cubic root of 12161040 is about 229.9624387307.

Adding to 12161040 its reverse (4016121), we get a palindrome (16177161).

The spelling of 12161040 in words is "twelve million, one hundred sixty-one thousand, forty".