40031212 has 24 divisors (see below), whose sum is σ = 75675600. Its totient is φ = 18419136.

The previous prime is 40031203. The next prime is 40031213. The reversal of 40031212 is 21213004.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 40031192 and 40031201.

It is not an unprimeable number, because it can be changed into a prime (40031213) 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, 19239 + ... + 21217.

It is an arithmetic number, because the mean of its divisors is an integer number (3153150).

Almost surely, 2^40031212 is an apocalyptic number.

It is an amenable number.

40031212 is a deficient number, since it is larger than the sum of its proper divisors (35644388).

40031212 is a wasteful number, since it uses less digits than its factorization.

40031212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2385 (or 2383 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 40031212 is about 6327.0223644302. The cubic root of 40031212 is about 342.0841191574.

Adding to 40031212 its reverse (21213004), we get a palindrome (61244216).

The spelling of 40031212 in words is "forty million, thirty-one thousand, two hundred twelve".