148138921 has 8 divisors (see below), whose sum is σ = 169784064. Its totient is φ = 126614400.

The previous prime is 148138889. The next prime is 148138937. The reversal of 148138921 is 129831841.

148138921 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 a cyclic number.

It is not a de Polignac number, because 148138921 - 2⁵ = 148138889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (148138951) 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, 27505 + ... + 32446.

It is an arithmetic number, because the mean of its divisors is an integer number (21223008).

Almost surely, 2^148138921 is an apocalyptic number.

It is an amenable number.

148138921 is a deficient number, since it is larger than the sum of its proper divisors (21645143).

148138921 is an equidigital number, since it uses as much as digits as its factorization.

148138921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60311.

The product of its digits is 13824, while the sum is 37.

The square root of 148138921 is about 12171.2333393128. The cubic root of 148138921 is about 529.1226983728.

The spelling of 148138921 in words is "one hundred forty-eight million, one hundred thirty-eight thousand, nine hundred twenty-one".