40172112 has 100 divisors (see below), whose sum is σ = 117631360. Its totient is φ = 13234752.

The previous prime is 40172107. The next prime is 40172117. The reversal of 40172112 is 21127104.

It is an interprime number because it is at equal distance from previous prime (40172107) and next prime (40172117).

It is a super-2 number, since 2×40172112² = 3227597165081088, which contains 22 as substring.

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 (40172117) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 180033 + ... + 180255.

Almost surely, 2^40172112 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 40172112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58815680).

40172112 is an abundant number, since it is smaller than the sum of its proper divisors (77459248).

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

40172112 is a wasteful number, since it uses less digits than its factorization.

40172112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382 (or 367 counting only the distinct ones).

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

The square root of 40172112 is about 6338.1473633862. The cubic root of 40172112 is about 342.4849997871.

Adding to 40172112 its reverse (21127104), we get a palindrome (61299216).

The spelling of 40172112 in words is "forty million, one hundred seventy-two thousand, one hundred twelve".