746721993 has 8 divisors (see below), whose sum is σ = 1002312000. Its totient is φ = 494473328.

The previous prime is 746721977. The next prime is 746722007. The reversal of 746721993 is 399127647.

It is a happy number.

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 746721993 - 2⁴ = 746721977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (746721973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 834813 + ... + 835706.

It is an arithmetic number, because the mean of its divisors is an integer number (125289000).

Almost surely, 2^746721993 is an apocalyptic number.

It is an amenable number.

746721993 is a deficient number, since it is larger than the sum of its proper divisors (255590007).

746721993 is a wasteful number, since it uses less digits than its factorization.

746721993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1670671.

The product of its digits is 571536, while the sum is 48.

The square root of 746721993 is about 27326.2143920449. The cubic root of 746721993 is about 907.2346890421.

The spelling of 746721993 in words is "seven hundred forty-six million, seven hundred twenty-one thousand, nine hundred ninety-three".