154138640 has 80 divisors (see below), whose sum is σ = 393724800. Its totient is φ = 55858176.

The previous prime is 154138637. The next prime is 154138651. The reversal of 154138640 is 46831451.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 154138597 and 154138606.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 32756 + ... + 37164.

It is an arithmetic number, because the mean of its divisors is an integer number (4921560).

Almost surely, 2^154138640 is an apocalyptic number.

154138640 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 154138640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196862400).

154138640 is an abundant number, since it is smaller than the sum of its proper divisors (239586160).

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

154138640 is a wasteful number, since it uses less digits than its factorization.

154138640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4464 (or 4458 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 154138640 is about 12415.2583541383. The cubic root of 154138640 is about 536.1716425120.

The spelling of 154138640 in words is "one hundred fifty-four million, one hundred thirty-eight thousand, six hundred forty".