40007232 has 42 divisors (see below), whose sum is σ = 114675158. Its totient is φ = 13335552.

The previous prime is 40007221. The next prime is 40007237. The reversal of 40007232 is 23270004.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 26873856 + 13133376 = 5184^2 + 3624^2 .

It is a super-2 number, since 2×40007232² = 3201157224603648, 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 (40007237) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34153 + ... + 35304.

Almost surely, 2^40007232 is an apocalyptic number.

It is an amenable number.

40007232 is an abundant number, since it is smaller than the sum of its proper divisors (74667926).

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

40007232 is a wasteful number, since it uses less digits than its factorization.

40007232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69475 (or 69462 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 40007232 is about 6325.1270342974. The cubic root of 40007232 is about 342.0157990034.

Adding to 40007232 its reverse (23270004), we get a palindrome (63277236).

The spelling of 40007232 in words is "forty million, seven thousand, two hundred thirty-two".