40121424 has 120 divisors (see below), whose sum is σ = 130920192. Its totient is φ = 11232000.

The previous prime is 40121423. The next prime is 40121429. The reversal of 40121424 is 42412104.

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

It is a junction number, because it is equal to n+sod(n) for n = 40121397 and 40121406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40121423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53049 + ... + 53799.

Almost surely, 2^40121424 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 40121424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65460096).

40121424 is an abundant number, since it is smaller than the sum of its proper divisors (90798768).

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

40121424 is a wasteful number, since it uses less digits than its factorization.

40121424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825 (or 816 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 40121424 is about 6334.1474564459. The cubic root of 40121424 is about 342.3408932969.

Adding to 40121424 its reverse (42412104), we get a palindrome (82533528).

The spelling of 40121424 in words is "forty million, one hundred twenty-one thousand, four hundred twenty-four".