144239778 has 40 divisors (see below), whose sum is σ = 328703760. Its totient is φ = 47261880.

The previous prime is 144239761. The next prime is 144239789. The reversal of 144239778 is 877932441.

It is a super-2 number, since 2×144239778² = 41610227114978568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2013 + ... + 17103.

It is an arithmetic number, because the mean of its divisors is an integer number (8217594).

Almost surely, 2^144239778 is an apocalyptic number.

144239778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 144239778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164351880).

144239778 is an abundant number, since it is smaller than the sum of its proper divisors (184463982).

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

144239778 is a wasteful number, since it uses less digits than its factorization.

144239778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15164 (or 15155 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 144239778 is about 12009.9865944971. The cubic root of 144239778 is about 524.4390416502.

The spelling of 144239778 in words is "one hundred forty-four million, two hundred thirty-nine thousand, seven hundred seventy-eight".