747921 has 12 divisors (see below), whose sum is σ = 1028976. Its totient is φ = 483120.

The previous prime is 747919. The next prime is 747941. The reversal of 747921 is 129747.

747921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 747921 - 2¹ = 747919 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

747921 is a lucky number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (747941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11130 + ... + 11196.

It is an arithmetic number, because the mean of its divisors is an integer number (85748).

2⁷⁴⁷⁹²¹ is an apocalyptic number.

It is an amenable number.

747921 is a deficient number, since it is larger than the sum of its proper divisors (281055).

747921 is an equidigital number, since it uses as much as digits as its factorization.

747921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 131 counting only the distinct ones).

The product of its digits is 3528, while the sum is 30.

The square root of 747921 is about 864.8242596042. The cubic root of 747921 is about 90.7720009798.

The spelling of 747921 in words is "seven hundred forty-seven thousand, nine hundred twenty-one".