1421839729 has 2 divisors, whose sum is σ = 1421839730. Its totient is φ = 1421839728.

The previous prime is 1421839687. The next prime is 1421839759. The reversal of 1421839729 is 9279381241.

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., 1100713329 + 321126400 = 33177^2 + 17920^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421839729 - 2²⁹ = 884968817 is a prime.

It is not a weakly prime, because it can be changed into another prime (1421839759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710919864 + 710919865.

It is an arithmetic number, because the mean of its divisors is an integer number (710919865).

Almost surely, 2^1421839729 is an apocalyptic number.

It is an amenable number.

1421839729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421839729 is an equidigital number, since it uses as much as digits as its factorization.

1421839729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 1421839729 is about 37707.2901306896. The cubic root of 1421839729 is about 1124.4760632556.

The spelling of 1421839729 in words is "one billion, four hundred twenty-one million, eight hundred thirty-nine thousand, seven hundred twenty-nine".