40513212 has 72 divisors (see below), whose sum is σ = 108055584. Its totient is φ = 12773376.

The previous prime is 40513177. The next prime is 40513217. The reversal of 40513212 is 21231504.

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 (40513217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93348 + ... + 93780.

It is an arithmetic number, because the mean of its divisors is an integer number (1500772).

Almost surely, 2^40513212 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 40513212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54027792).

40513212 is an abundant number, since it is smaller than the sum of its proper divisors (67542372).

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

40513212 is a wasteful number, since it uses less digits than its factorization.

40513212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 40513212 is about 6364.9989787902. The cubic root of 40513212 is about 343.4516118284.

Adding to 40513212 its reverse (21231504), we get a palindrome (61744716).

The spelling of 40513212 in words is "forty million, five hundred thirteen thousand, two hundred twelve".