40213512 has 24 divisors (see below), whose sum is σ = 108911790. Its totient is φ = 13404480.

The previous prime is 40213469. The next prime is 40213513. The reversal of 40213512 is 21531204.

It can be written as a sum of positive squares in only one way, i.e., 39614436 + 599076 = 6294^2 + 774^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (40213513) 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, 279189 + ... + 279332.

Almost surely, 2^40213512 is an apocalyptic number.

It is an amenable number.

40213512 is an abundant number, since it is smaller than the sum of its proper divisors (68698278).

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

40213512 is a wasteful number, since it uses less digits than its factorization.

40213512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558533 (or 558526 counting only the distinct ones).

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

The square root of 40213512 is about 6341.4124609585. The cubic root of 40213512 is about 342.6026104902.

Adding to 40213512 its reverse (21531204), we get a palindrome (61744716).

The spelling of 40213512 in words is "forty million, two hundred thirteen thousand, five hundred twelve".