40172242 has 16 divisors (see below), whose sum is σ = 66284064. Its totient is φ = 18258900.

The previous prime is 40172203. The next prime is 40172243. The reversal of 40172242 is 24227104.

It is a happy number.

It is a super-2 number, since 2×40172242² = 3227618054613128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (40172243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4884 + ... + 10207.

It is an arithmetic number, because the mean of its divisors is an integer number (4142754).

Almost surely, 2^40172242 is an apocalyptic number.

40172242 is a deficient number, since it is larger than the sum of its proper divisors (26111822).

40172242 is a wasteful number, since it uses less digits than its factorization.

40172242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15126 (or 15104 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 40172242 is about 6338.1576187406. The cubic root of 40172242 is about 342.4853692225.

Adding to 40172242 its reverse (24227104), we get a palindrome (64399346).

The spelling of 40172242 in words is "forty million, one hundred seventy-two thousand, two hundred forty-two".