144226440 has 64 divisors (see below), whose sum is σ = 480758400. Its totient is φ = 38460096.

The previous prime is 144226417. The next prime is 144226447. The reversal of 144226440 is 44622441.

It is a happy number.

144226440 is a `hidden beast` number, since 14 + 4 + 2 + 2 + 644 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (144226447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65692 + ... + 67851.

It is an arithmetic number, because the mean of its divisors is an integer number (7511850).

Almost surely, 2^144226440 is an apocalyptic number.

144226440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

144226440 is an abundant number, since it is smaller than the sum of its proper divisors (336531960).

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

144226440 is a wasteful number, since it uses less digits than its factorization.

144226440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133563 (or 133553 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

The square root of 144226440 is about 12009.4312937791. The cubic root of 144226440 is about 524.4228760135.

Adding to 144226440 its reverse (44622441), we get a palindrome (188848881).

The spelling of 144226440 in words is "one hundred forty-four million, two hundred twenty-six thousand, four hundred forty".