156621444 has 144 divisors (see below), whose sum is σ = 457043328. Its totient is φ = 41513472.

The previous prime is 156621433. The next prime is 156621449. The reversal of 156621444 is 444126651.

It is not an unprimeable number, because it can be changed into a prime (156621449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 500232 + ... + 500544.

It is an arithmetic number, because the mean of its divisors is an integer number (3173912).

Almost surely, 2^156621444 is an apocalyptic number.

156621444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 156621444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228521664).

156621444 is an abundant number, since it is smaller than the sum of its proper divisors (300421884).

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

156621444 is a wasteful number, since it uses less digits than its factorization.

156621444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394 (or 385 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 156621444 is about 12514.8489403588. The cubic root of 156621444 is about 539.0351357317.

The spelling of 156621444 in words is "one hundred fifty-six million, six hundred twenty-one thousand, four hundred forty-four".