154401220 has 48 divisors (see below), whose sum is σ = 353102400. Its totient is φ = 56488320.

The previous prime is 154401217. The next prime is 154401227. The reversal of 154401220 is 22104451.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (154401227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4015 + ... + 18025.

It is an arithmetic number, because the mean of its divisors is an integer number (7356300).

Almost surely, 2^154401220 is an apocalyptic number.

154401220 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 154401220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176551200).

154401220 is an abundant number, since it is smaller than the sum of its proper divisors (198701180).

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

154401220 is a wasteful number, since it uses less digits than its factorization.

154401220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14068 (or 14066 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 154401220 is about 12425.8287449973. The cubic root of 154401220 is about 536.4759315164.

Adding to 154401220 its reverse (22104451), we get a palindrome (176505671).

The spelling of 154401220 in words is "one hundred fifty-four million, four hundred one thousand, two hundred twenty".