1429390621 has 2 divisors, whose sum is σ = 1429390622. Its totient is φ = 1429390620.

The previous prime is 1429390609. The next prime is 1429390661. The reversal of 1429390621 is 1260939241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 955675396 + 473715225 = 30914^2 + 21765^2 .

It is a cyclic number.

It is not a de Polignac number, because 1429390621 - 2¹¹ = 1429388573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1429390661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 714695310 + 714695311.

It is an arithmetic number, because the mean of its divisors is an integer number (714695311).

Almost surely, 2^1429390621 is an apocalyptic number.

It is an amenable number.

1429390621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1429390621 is an equidigital number, since it uses as much as digits as its factorization.

1429390621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 1429390621 is about 37807.2826450143. The cubic root of 1429390621 is about 1126.4631158462.

The spelling of 1429390621 in words is "one billion, four hundred twenty-nine million, three hundred ninety thousand, six hundred twenty-one".