1438429021 has 2 divisors, whose sum is σ = 1438429022. Its totient is φ = 1438429020.

The previous prime is 1438428941. The next prime is 1438429033. The reversal of 1438429021 is 1209248341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1435348996 + 3080025 = 37886^2 + 1755^2 .

It is a cyclic number.

It is not a de Polignac number, because 1438429021 - 2¹¹ = 1438426973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1438429081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719214510 + 719214511.

It is an arithmetic number, because the mean of its divisors is an integer number (719214511).

Almost surely, 2^1438429021 is an apocalyptic number.

It is an amenable number.

1438429021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438429021 is an equidigital number, since it uses as much as digits as its factorization.

1438429021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 1438429021 is about 37926.6268075609. The cubic root of 1438429021 is about 1128.8324330543.

The spelling of 1438429021 in words is "one billion, four hundred thirty-eight million, four hundred twenty-nine thousand, twenty-one".