1321926445 has 16 divisors (see below), whose sum is σ = 1816513920. Its totient is φ = 904670784.

The previous prime is 1321926427. The next prime is 1321926451. The reversal of 1321926445 is 5446291231.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1321926445 - 2²¹ = 1319829293 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19287 + ... + 54916.

It is an arithmetic number, because the mean of its divisors is an integer number (113532120).

Almost surely, 2^1321926445 is an apocalyptic number.

It is an amenable number.

1321926445 is a deficient number, since it is larger than the sum of its proper divisors (494587475).

1321926445 is an equidigital number, since it uses as much as digits as its factorization.

1321926445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74724.

The product of its digits is 51840, while the sum is 37.

The square root of 1321926445 is about 36358.3064099526. The cubic root of 1321926445 is about 1097.4946964527.

The spelling of 1321926445 in words is "one billion, three hundred twenty-one million, nine hundred twenty-six thousand, four hundred forty-five".