1074730721 has 4 divisors (see below), whose sum is σ = 1074798000. Its totient is φ = 1074663444.

The previous prime is 1074730697. The next prime is 1074730733. The reversal of 1074730721 is 1270374701.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1270374701 = 6373 ⋅199337.

It is a cyclic number.

It is not a de Polignac number, because 1074730721 - 2¹⁰ = 1074729697 is a prime.

It is a super-2 number, since 2×1074730721² = 2310092245322359682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1074730781) 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, 5510 + ... + 46688.

It is an arithmetic number, because the mean of its divisors is an integer number (268699500).

Almost surely, 2^1074730721 is an apocalyptic number.

It is an amenable number.

1074730721 is a deficient number, since it is larger than the sum of its proper divisors (67279).

1074730721 is an equidigital number, since it uses as much as digits as its factorization.

1074730721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67278.

The product of its (nonzero) digits is 8232, while the sum is 32.

The square root of 1074730721 is about 32783.0858980664. The cubic root of 1074730721 is about 1024.3142654323.

The spelling of 1074730721 in words is "one billion, seventy-four million, seven hundred thirty thousand, seven hundred twenty-one".