144220646 has 4 divisors (see below), whose sum is σ = 216330972. Its totient is φ = 72110322.

The previous prime is 144220613. The next prime is 144220679. The reversal of 144220646 is 646022441.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 646022441 = 1153 ⋅560297.

It is an interprime number because it is at equal distance from previous prime (144220613) and next prime (144220679).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36055160 + ... + 36055163.

It is an arithmetic number, because the mean of its divisors is an integer number (54082743).

Almost surely, 2^144220646 is an apocalyptic number.

144220646 is a deficient number, since it is larger than the sum of its proper divisors (72110326).

144220646 is an equidigital number, since it uses as much as digits as its factorization.

144220646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72110325.

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 144220646 is about 12009.1900642799. The cubic root of 144220646 is about 524.4158533834.

The spelling of 144220646 in words is "one hundred forty-four million, two hundred twenty thousand, six hundred forty-six".