1026406921 has 4 divisors (see below), whose sum is σ = 1026482500. Its totient is φ = 1026331344.

The previous prime is 1026406879. The next prime is 1026406933. The reversal of 1026406921 is 1296046201.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 257121225 + 769285696 = 16035^2 + 27736^2 .

It is a cyclic number.

It is not a de Polignac number, because 1026406921 - 2⁷ = 1026406793 is a prime.

It is a super-2 number, since 2×1026406921² = 2107022334953400482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1026406951) 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, 11166 + ... + 46663.

It is an arithmetic number, because the mean of its divisors is an integer number (256620625).

Almost surely, 2^1026406921 is an apocalyptic number.

It is an amenable number.

1026406921 is a deficient number, since it is larger than the sum of its proper divisors (75579).

1026406921 is an equidigital number, since it uses as much as digits as its factorization.

1026406921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75578.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1026406921 is about 32037.5860669932. The cubic root of 1026406921 is about 1008.7259434406.

It can be divided in two parts, 102640 and 6921, that added together give a square (109561 = 331²).

The spelling of 1026406921 in words is "one billion, twenty-six million, four hundred six thousand, nine hundred twenty-one".