1438381837 has 2 divisors, whose sum is σ = 1438381838. Its totient is φ = 1438381836.

The previous prime is 1438381831. The next prime is 1438381897. The reversal of 1438381837 is 7381838341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1438381476 + 361 = 37926^2 + 19^2 .

It is a cyclic number.

It is not a de Polignac number, because 1438381837 - 2¹⁹ = 1437857549 is a prime.

It is a super-2 number, since 2×1438381837² = 4137884618022989138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1438381831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719190918 + 719190919.

It is an arithmetic number, because the mean of its divisors is an integer number (719190919).

Almost surely, 2^1438381837 is an apocalyptic number.

It is an amenable number.

1438381837 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438381837 is an equidigital number, since it uses as much as digits as its factorization.

1438381837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 46.

The square root of 1438381837 is about 37926.0047592677. The cubic root of 1438381837 is about 1128.8200900951.

The spelling of 1438381837 in words is "one billion, four hundred thirty-eight million, three hundred eighty-one thousand, eight hundred thirty-seven".