1438227961 has 4 divisors (see below), whose sum is σ = 1438652772. Its totient is φ = 1437803152.

The previous prime is 1438227937. The next prime is 1438227983. The reversal of 1438227961 is 1697228341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1697228341 = 101 ⋅16804241.

It can be written as a sum of positive squares in 2 ways, for example, as 1409551936 + 28676025 = 37544^2 + 5355^2 .

It is a cyclic number.

It is not a de Polignac number, because 1438227961 - 2⁹ = 1438227449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1438227911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207286 + ... + 214111.

It is an arithmetic number, because the mean of its divisors is an integer number (359663193).

Almost surely, 2^1438227961 is an apocalyptic number.

It is an amenable number.

1438227961 is a deficient number, since it is larger than the sum of its proper divisors (424811).

1438227961 is an equidigital number, since it uses as much as digits as its factorization.

1438227961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424810.

The product of its digits is 145152, while the sum is 43.

The square root of 1438227961 is about 37923.9760705546. The cubic root of 1438227961 is about 1128.7798354817.

The spelling of 1438227961 in words is "one billion, four hundred thirty-eight million, two hundred twenty-seven thousand, nine hundred sixty-one".