456400721 has 4 divisors (see below), whose sum is σ = 521600832. Its totient is φ = 391200612.

The previous prime is 456400697. The next prime is 456400723. The reversal of 456400721 is 127004654.

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.

It is a cyclic number.

It is not a de Polignac number, because 456400721 - 2¹⁴ = 456384337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (456400723) 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, 32600045 + ... + 32600058.

It is an arithmetic number, because the mean of its divisors is an integer number (130400208).

Almost surely, 2^456400721 is an apocalyptic number.

It is an amenable number.

456400721 is a deficient number, since it is larger than the sum of its proper divisors (65200111).

456400721 is an equidigital number, since it uses as much as digits as its factorization.

456400721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65200110.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 456400721 is about 21363.5371837156. The cubic root of 456400721 is about 769.9256244573.

The spelling of 456400721 in words is "four hundred fifty-six million, four hundred thousand, seven hundred twenty-one".