149821 has 8 divisors (see below), whose sum is σ = 181440. Its totient is φ = 120768.

The previous prime is 149803. The next prime is 149827. The reversal of 149821 is 128941.

It is a happy number.

149821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 149821 - 2⁹ = 149309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149827) 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, 511 + ... + 748.

It is an arithmetic number, because the mean of its divisors is an integer number (22680).

2¹⁴⁹⁸²¹ is an apocalyptic number.

It is an amenable number.

149821 is a deficient number, since it is larger than the sum of its proper divisors (31619).

149821 is a wasteful number, since it uses less digits than its factorization.

149821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283.

The product of its digits is 576, while the sum is 25.

The square root of 149821 is about 387.0671776320. The cubic root of 149821 is about 53.1117849483. Note that the first 3 decimals are identical.

The spelling of 149821 in words is "one hundred forty-nine thousand, eight hundred twenty-one".