154721840 has 160 divisors (see below), whose sum is σ = 452221056. Its totient is φ = 47923200.

The previous prime is 154721797. The next prime is 154721843. The reversal of 154721840 is 48127451.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 154721797 and 154721806.

It is not an unprimeable number, because it can be changed into a prime (154721843) 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 31 ways as a sum of consecutive naturals, for example, 385640 + ... + 386040.

Almost surely, 2^154721840 is an apocalyptic number.

154721840 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 154721840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226110528).

154721840 is an abundant number, since it is smaller than the sum of its proper divisors (297499216).

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

154721840 is a wasteful number, since it uses less digits than its factorization.

154721840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487 (or 481 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 154721840 is about 12438.7234071668. The cubic root of 154721840 is about 536.8470123323.

The spelling of 154721840 in words is "one hundred fifty-four million, seven hundred twenty-one thousand, eight hundred forty".