40144212 has 18 divisors (see below), whose sum is σ = 101475738. Its totient is φ = 13381392.

The previous prime is 40144183. The next prime is 40144229. The reversal of 40144212 is 21244104.

It can be written as a sum of positive squares in only one way, i.e., 29095236 + 11048976 = 5394^2 + 3324^2 .

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

It is a super-2 number, since 2×40144212² = 3223115514201888, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 557523 + ... + 557594.

It is an arithmetic number, because the mean of its divisors is an integer number (5637541).

Almost surely, 2^40144212 is an apocalyptic number.

It is an amenable number.

40144212 is an abundant number, since it is smaller than the sum of its proper divisors (61331526).

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

40144212 is a wasteful number, since it uses less digits than its factorization.

40144212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115127 (or 1115122 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 40144212 is about 6335.9460224974. The cubic root of 40144212 is about 342.4056948168.

Adding to 40144212 its reverse (21244104), we get a palindrome (61388316).

The spelling of 40144212 in words is "forty million, one hundred forty-four thousand, two hundred twelve".