1026245721 has 8 divisors (see below), whose sum is σ = 1374006304. Its totient is φ = 681324480.

The previous prime is 1026245719. The next prime is 1026245723. The reversal of 1026245721 is 1275426201.

1026245721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1026245719) and next prime (1026245723).

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

It is not a de Polignac number, because 1026245721 - 2¹ = 1026245719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1026245723) 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, 708991 + ... + 710436.

It is an arithmetic number, because the mean of its divisors is an integer number (171750788).

Almost surely, 2^1026245721 is an apocalyptic number.

It is an amenable number.

1026245721 is a deficient number, since it is larger than the sum of its proper divisors (347760583).

1026245721 is a wasteful number, since it uses less digits than its factorization.

1026245721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419671.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 1026245721 is about 32035.0701731712. The cubic root of 1026245721 is about 1008.6731329577.

It can be divided in two parts, 102624 and 5721, that added together give a triangular number (108345 = T₄₆₅).

The spelling of 1026245721 in words is "one billion, twenty-six million, two hundred forty-five thousand, seven hundred twenty-one".