40421172 has 48 divisors (see below), whose sum is σ = 108948672. Its totient is φ = 11527680.

The previous prime is 40421153. The next prime is 40421177. The reversal of 40421172 is 27112404.

It is a happy number.

It is a super-2 number, since 2×40421172² = 3267742291707168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40421177) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6763 + ... + 11250.

It is an arithmetic number, because the mean of its divisors is an integer number (2269764).

Almost surely, 2^40421172 is an apocalyptic number.

It is an amenable number.

40421172 is an abundant number, since it is smaller than the sum of its proper divisors (68527500).

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

40421172 is a wasteful number, since it uses less digits than its factorization.

40421172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18048 (or 18046 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 40421172 is about 6357.7647015284. The cubic root of 40421172 is about 343.1913242682.

Adding to 40421172 its reverse (27112404), we get a palindrome (67533576).

The spelling of 40421172 in words is "forty million, four hundred twenty-one thousand, one hundred seventy-two".