154887840 has 144 divisors (see below), whose sum is σ = 546928200. Its totient is φ = 39868416.

The previous prime is 154887827. The next prime is 154887841. The reversal of 154887840 is 48788451.

It can be written as a sum of positive squares in 4 ways, for example, as 109244304 + 45643536 = 10452^2 + 6756^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (154887841) 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 23 ways as a sum of consecutive naturals, for example, 39906 + ... + 43614.

Almost surely, 2^154887840 is an apocalyptic number.

154887840 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 154887840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273464100).

154887840 is an abundant number, since it is smaller than the sum of its proper divisors (392040360).

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

154887840 is a wasteful number, since it uses less digits than its factorization.

154887840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3759 (or 3748 counting only the distinct ones).

The product of its (nonzero) digits is 286720, while the sum is 45.

The square root of 154887840 is about 12445.3943288270. The cubic root of 154887840 is about 537.0389368685.

The spelling of 154887840 in words is "one hundred fifty-four million, eight hundred eighty-seven thousand, eight hundred forty".