151821440 has 64 divisors (see below), whose sum is σ = 365584320. Its totient is φ = 60288000.

The previous prime is 151821431. The next prime is 151821443. The reversal of 151821440 is 44128151.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (151821443) 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, 95855 + ... + 97425.

It is an arithmetic number, because the mean of its divisors is an integer number (5712255).

Almost surely, 2^151821440 is an apocalyptic number.

151821440 is a gapful number since it is divisible by the number (10) 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 151821440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182792160).

151821440 is an abundant number, since it is smaller than the sum of its proper divisors (213762880).

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

151821440 is a wasteful number, since it uses less digits than its factorization.

151821440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1741 (or 1729 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 151821440 is about 12321.5843137155. The cubic root of 151821440 is about 533.4712698778.

Adding to 151821440 its reverse (44128151), we get a palindrome (195949591).

The spelling of 151821440 in words is "one hundred fifty-one million, eight hundred twenty-one thousand, four hundred forty".