154421440 has 56 divisors (see below), whose sum is σ = 368777520. Its totient is φ = 61590528.

The previous prime is 154421429. The next prime is 154421441. The reversal of 154421440 is 44124451.

It is a super-2 number, since 2×154421440² = 47691962263347200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (154421441) 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, 208591 + ... + 209329.

Almost surely, 2^154421440 is an apocalyptic number.

154421440 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 154421440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184388760).

154421440 is an abundant number, since it is smaller than the sum of its proper divisors (214356080).

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

154421440 is an equidigital number, since it uses as much as digits as its factorization.

154421440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409 (or 1399 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 154421440 is about 12426.6423461851. The cubic root of 154421440 is about 536.4993490124.

Adding to 154421440 its reverse (44124451), we get a palindrome (198545891).

The spelling of 154421440 in words is "one hundred fifty-four million, four hundred twenty-one thousand, four hundred forty".