40243212 has 18 divisors (see below), whose sum is σ = 101725988. Its totient is φ = 13414392.

The previous prime is 40243211. The next prime is 40243223. The reversal of 40243212 is 21234204.

Added to its reverse (21234204) it gives a triangular number (61477416 = T₁₁₀₈₈).

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×40243212² = 3239032224153888, which contains 22 as substring.

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 (40243211) 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, 558898 + ... + 558969.

Almost surely, 2^40243212 is an apocalyptic number.

It is an amenable number.

40243212 is an abundant number, since it is smaller than the sum of its proper divisors (61482776).

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

40243212 is a wasteful number, since it uses less digits than its factorization.

40243212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117877 (or 1117872 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 40243212 is about 6343.7537783240. The cubic root of 40243212 is about 342.6869336695.

Adding to 40243212 its reverse (21234204), we get a palindrome (61477416).

The spelling of 40243212 in words is "forty million, two hundred forty-three thousand, two hundred twelve".