1438649851 has 2 divisors, whose sum is σ = 1438649852. Its totient is φ = 1438649850.

The previous prime is 1438649833. The next prime is 1438649857. The reversal of 1438649851 is 1589468341.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1438649851 - 2⁵ = 1438649819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1438649795 and 1438649804.

It is not a weakly prime, because it can be changed into another prime (1438649857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719324925 + 719324926.

It is an arithmetic number, because the mean of its divisors is an integer number (719324926).

Almost surely, 2^1438649851 is an apocalyptic number.

1438649851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438649851 is an equidigital number, since it uses as much as digits as its factorization.

1438649851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440, while the sum is 49.

The square root of 1438649851 is about 37929.5379750400. The cubic root of 1438649851 is about 1128.8901968385.

The spelling of 1438649851 in words is "one billion, four hundred thirty-eight million, six hundred forty-nine thousand, eight hundred fifty-one".