144639420 has 24 divisors (see below), whose sum is σ = 404990544. Its totient is φ = 38570496.

The previous prime is 144639413. The next prime is 144639421. The reversal of 144639420 is 24936441.

144639420 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144639421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1205269 + ... + 1205388.

It is an arithmetic number, because the mean of its divisors is an integer number (16874606).

Almost surely, 2^144639420 is an apocalyptic number.

144639420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

144639420 is an abundant number, since it is smaller than the sum of its proper divisors (260351124).

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

144639420 is a wasteful number, since it uses less digits than its factorization.

144639420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2410669 (or 2410667 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 144639420 is about 12026.6129895328. The cubic root of 144639420 is about 524.9229456074.

The spelling of 144639420 in words is "one hundred forty-four million, six hundred thirty-nine thousand, four hundred twenty".