746937221 has 6 divisors (see below), whose sum is σ = 765601266. Its totient is φ = 728717600.

The previous prime is 746937209. The next prime is 746937229. The reversal of 746937221 is 122739647.

It can be written as a sum of positive squares in 3 ways, for example, as 17181025 + 729756196 = 4145^2 + 27014^2 .

It is a de Polignac number, because none of the positive numbers 2^k-746937221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (746937229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 220490 + ... + 223851.

It is an arithmetic number, because the mean of its divisors is an integer number (127600211).

Almost surely, 2^746937221 is an apocalyptic number.

It is an amenable number.

746937221 is a deficient number, since it is larger than the sum of its proper divisors (18664045).

746937221 is an equidigital number, since it uses as much as digits as its factorization.

746937221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444423 (or 444382 counting only the distinct ones).

The product of its digits is 127008, while the sum is 41.

The square root of 746937221 is about 27330.1522315555. The cubic root of 746937221 is about 907.3218448833.

The spelling of 746937221 in words is "seven hundred forty-six million, nine hundred thirty-seven thousand, two hundred twenty-one".