154221840 has 80 divisors (see below), whose sum is σ = 531216000. Its totient is φ = 41125248.

The previous prime is 154221839. The next prime is 154221853. The reversal of 154221840 is 48122451.

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

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33540 + ... + 37859.

It is an arithmetic number, because the mean of its divisors is an integer number (6640200).

Almost surely, 2^154221840 is an apocalyptic number.

154221840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

154221840 is an abundant number, since it is smaller than the sum of its proper divisors (376994160).

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

154221840 is a wasteful number, since it uses less digits than its factorization.

154221840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71421 (or 71409 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 154221840 is about 12418.6086177156. The cubic root of 154221840 is about 536.2680956288.

The spelling of 154221840 in words is "one hundred fifty-four million, two hundred twenty-one thousand, eight hundred forty".