40390212 has 12 divisors (see below), whose sum is σ = 94243856. Its totient is φ = 13463400.

The previous prime is 40390211. The next prime is 40390237. The reversal of 40390212 is 21209304.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (40390211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1682914 + ... + 1682937.

Almost surely, 2^40390212 is an apocalyptic number.

It is an amenable number.

40390212 is an abundant number, since it is smaller than the sum of its proper divisors (53853644).

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

40390212 is a wasteful number, since it uses less digits than its factorization.

40390212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3365858 (or 3365856 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 40390212 is about 6355.3294171113. The cubic root of 40390212 is about 343.1036811118.

Adding to 40390212 its reverse (21209304), we get a palindrome (61599516).

The spelling of 40390212 in words is "forty million, three hundred ninety thousand, two hundred twelve".