1421440645 has 8 divisors (see below), whose sum is σ = 1709901720. Its totient is φ = 1134370560.

The previous prime is 1421440633. The next prime is 1421440651. The reversal of 1421440645 is 5460441241.

It can be written as a sum of positive squares in 4 ways, for example, as 46662561 + 1374778084 = 6831^2 + 37078^2 .

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

It is not a de Polignac number, because 1421440645 - 2²¹ = 1419343493 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 345496 + ... + 349585.

It is an arithmetic number, because the mean of its divisors is an integer number (213737715).

Almost surely, 2^1421440645 is an apocalyptic number.

It is an amenable number.

1421440645 is a deficient number, since it is larger than the sum of its proper divisors (288461075).

1421440645 is an equidigital number, since it uses as much as digits as its factorization.

1421440645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695495.

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 1421440645 is about 37701.9978913585. The cubic root of 1421440645 is about 1124.3708468966.

Adding to 1421440645 its reverse (5460441241), we get a palindrome (6881881886).

The spelling of 1421440645 in words is "one billion, four hundred twenty-one million, four hundred forty thousand, six hundred forty-five".