148732721 has 4 divisors (see below), whose sum is σ = 150176832. Its totient is φ = 147288612.

The previous prime is 148732709. The next prime is 148732723. The reversal of 148732721 is 127237841.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 148732721 - 2¹⁸ = 148470577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (148732723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 721901 + ... + 722106.

It is an arithmetic number, because the mean of its divisors is an integer number (37544208).

Almost surely, 2^148732721 is an apocalyptic number.

It is an amenable number.

148732721 is a deficient number, since it is larger than the sum of its proper divisors (1444111).

148732721 is a wasteful number, since it uses less digits than its factorization.

148732721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1444110.

The product of its digits is 18816, while the sum is 35.

The square root of 148732721 is about 12195.6025271407. The cubic root of 148732721 is about 529.8287342675.

The spelling of 148732721 in words is "one hundred forty-eight million, seven hundred thirty-two thousand, seven hundred twenty-one".