1438923961 has 2 divisors, whose sum is σ = 1438923962. Its totient is φ = 1438923960.

The previous prime is 1438923949. The next prime is 1438923989. The reversal of 1438923961 is 1693298341.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1037162025 + 401761936 = 32205^2 + 20044^2 .

It is a cyclic number.

It is not a de Polignac number, because 1438923961 - 2¹³ = 1438915769 is a prime.

It is not a weakly prime, because it can be changed into another prime (1438923361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719461980 + 719461981.

It is an arithmetic number, because the mean of its divisors is an integer number (719461981).

Almost surely, 2^1438923961 is an apocalyptic number.

It is an amenable number.

1438923961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438923961 is an equidigital number, since it uses as much as digits as its factorization.

1438923961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 46.

The square root of 1438923961 is about 37933.1512136812. The cubic root of 1438923961 is about 1128.9618891596.

The spelling of 1438923961 in words is "one billion, four hundred thirty-eight million, nine hundred twenty-three thousand, nine hundred sixty-one".