1409660921 has 4 divisors (see below), whose sum is σ = 1422593700. Its totient is φ = 1396728144.

The previous prime is 1409660899. The next prime is 1409660933. The reversal of 1409660921 is 1290669041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1290669041 = 29 ⋅44505829.

It can be written as a sum of positive squares in 2 ways, for example, as 472627600 + 937033321 = 21740^2 + 30611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1409660921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1409660321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6466226 + ... + 6466443.

It is an arithmetic number, because the mean of its divisors is an integer number (355648425).

Almost surely, 2^1409660921 is an apocalyptic number.

It is an amenable number.

1409660921 is a deficient number, since it is larger than the sum of its proper divisors (12932779).

1409660921 is a wasteful number, since it uses less digits than its factorization.

1409660921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12932778.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 1409660921 is about 37545.4514022671. The cubic root of 1409660921 is about 1121.2562755555.

The spelling of 1409660921 in words is "one billion, four hundred nine million, six hundred sixty thousand, nine hundred twenty-one".