750400721 has 8 divisors (see below), whose sum is σ = 858549504. Its totient is φ = 642489120.

The previous prime is 750400669. The next prime is 750400727. The reversal of 750400721 is 127004057.

750400721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 750400721 - 2⁶ = 750400657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (750400727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52460 + ... + 65213.

It is an arithmetic number, because the mean of its divisors is an integer number (107318688).

Almost surely, 2^750400721 is an apocalyptic number.

It is an amenable number.

750400721 is a deficient number, since it is larger than the sum of its proper divisors (108148783).

750400721 is a wasteful number, since it uses less digits than its factorization.

750400721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118591.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 750400721 is about 27393.4430293090. The cubic root of 750400721 is about 908.7220805796.

Adding to 750400721 its reverse (127004057), we get a palindrome (877404778).

The spelling of 750400721 in words is "seven hundred fifty million, four hundred thousand, seven hundred twenty-one".