144721990 has 32 divisors (see below), whose sum is σ = 303796800. Its totient is φ = 49617792.

The previous prime is 144721987. The next prime is 144722021. The reversal of 144721990 is 99127441.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17667 + ... + 24526.

It is an arithmetic number, because the mean of its divisors is an integer number (9493650).

Almost surely, 2^144721990 is an apocalyptic number.

144721990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

144721990 is an abundant number, since it is smaller than the sum of its proper divisors (159074810).

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

144721990 is an equidigital number, since it uses as much as digits as its factorization.

144721990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42221 (or 42207 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 144721990 is about 12030.0453033228. The cubic root of 144721990 is about 525.0228138234.

The spelling of 144721990 in words is "one hundred forty-four million, seven hundred twenty-one thousand, nine hundred ninety".