122131440 has 60 divisors (see below), whose sum is σ = 410160504. Its totient is φ = 32568192.

The previous prime is 122131421. The next prime is 122131447. The reversal of 122131440 is 44131221.

122131440 is a `hidden beast` number, since 1 + 221 + 3 + 1 + 440 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122131447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84094 + ... + 85533.

Almost surely, 2^122131440 is an apocalyptic number.

122131440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

122131440 is an abundant number, since it is smaller than the sum of its proper divisors (288029064).

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

122131440 is a wasteful number, since it uses less digits than its factorization.

122131440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169646 (or 169637 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 122131440 is about 11051.3094246791. The cubic root of 122131440 is about 496.1456171480.

Adding to 122131440 its reverse (44131221), we get a palindrome (166262661).

The spelling of 122131440 in words is "one hundred twenty-two million, one hundred thirty-one thousand, four hundred forty".