148705921 has 16 divisors (see below), whose sum is σ = 183992704. Its totient is φ = 117033984.

The previous prime is 148705903. The next prime is 148705927. The reversal of 148705921 is 129507841.

It is a cyclic number.

It is not a de Polignac number, because 148705921 - 2⁵ = 148705889 is a prime.

It is a super-2 number, since 2×148705921² = 44226901880916482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (148705927) by changing a digit.

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, 13330 + ... + 21796.

It is an arithmetic number, because the mean of its divisors is an integer number (11499544).

Almost surely, 2^148705921 is an apocalyptic number.

148705921 is the 7041-st hex number.

It is an amenable number.

148705921 is a deficient number, since it is larger than the sum of its proper divisors (35286783).

148705921 is a wasteful number, since it uses less digits than its factorization.

148705921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8680.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 148705921 is about 12194.5037209392. The cubic root of 148705921 is about 529.7969092530.

The spelling of 148705921 in words is "one hundred forty-eight million, seven hundred five thousand, nine hundred twenty-one".