908748721 has 4 divisors (see below), whose sum is σ = 909043200. Its totient is φ = 908454244.

The previous prime is 908748707. The next prime is 908748733. The reversal of 908748721 is 127847809.

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, and also an emirpimes, since its reverse is a distinct semiprime: 127847809 = 953 ⋅134153.

It is a cyclic number.

It is not a de Polignac number, because 908748721 - 2⁵ = 908748689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (908748761) 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, 142561 + ... + 148798.

It is an arithmetic number, because the mean of its divisors is an integer number (227260800).

Almost surely, 2^908748721 is an apocalyptic number.

It is an amenable number.

908748721 is a deficient number, since it is larger than the sum of its proper divisors (294479).

908748721 is a wasteful number, since it uses less digits than its factorization.

908748721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294478.

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 908748721 is about 30145.4593761648. The cubic root of 908748721 is about 968.6077454331.

The spelling of 908748721 in words is "nine hundred eight million, seven hundred forty-eight thousand, seven hundred twenty-one".