1409869921 has 2 divisors, whose sum is σ = 1409869922. Its totient is φ = 1409869920.

The previous prime is 1409869859. The next prime is 1409869927. The reversal of 1409869921 is 1299689041.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1367150625 + 42719296 = 36975^2 + 6536^2 .

It is a cyclic number.

It is not a de Polignac number, because 1409869921 - 2¹⁷ = 1409738849 is a prime.

It is not a weakly prime, because it can be changed into another prime (1409869927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 704934960 + 704934961.

It is an arithmetic number, because the mean of its divisors is an integer number (704934961).

Almost surely, 2^1409869921 is an apocalyptic number.

It is an amenable number.

1409869921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1409869921 is an equidigital number, since it uses as much as digits as its factorization.

1409869921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 49.

The square root of 1409869921 is about 37548.2345923214. The cubic root of 1409869921 is about 1121.3116862758.

The spelling of 1409869921 in words is "one billion, four hundred nine million, eight hundred sixty-nine thousand, nine hundred twenty-one".