40121172 has 144 divisors (see below), whose sum is σ = 128582272. Its totient is φ = 10264320.

The previous prime is 40121171. The next prime is 40121183. The reversal of 40121172 is 27112104.

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 (40121171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 121047 + ... + 121377.

Almost surely, 2^40121172 is an apocalyptic number.

40121172 is a gapful number since it is divisible by the number (42) 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 40121172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64291136).

40121172 is an abundant number, since it is smaller than the sum of its proper divisors (88461100).

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

40121172 is a wasteful number, since it uses less digits than its factorization.

40121172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 40121172 is about 6334.1275642349. The cubic root of 40121172 is about 342.3401765552.

Adding to 40121172 its reverse (27112104), we get a palindrome (67233276).

It can be divided in two parts, 4012 and 1172, that added together give a square (5184 = 72²).

The spelling of 40121172 in words is "forty million, one hundred twenty-one thousand, one hundred seventy-two".