1438894769 has 8 divisors (see below), whose sum is σ = 1603013160. Its totient is φ = 1282409856.

The previous prime is 1438894763. The next prime is 1438894771. The reversal of 1438894769 is 9674988341.

It can be written as a sum of positive squares in 4 ways, for example, as 247747600 + 1191147169 = 15740^2 + 34513^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1438894769 - 2¹⁶ = 1438829233 is a prime.

It is a super-2 number, since 2×1438894769² = 4140836312511126722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1438894763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1907972 + ... + 1908725.

It is an arithmetic number, because the mean of its divisors is an integer number (200376645).

Almost surely, 2^1438894769 is an apocalyptic number.

It is an amenable number.

1438894769 is a deficient number, since it is larger than the sum of its proper divisors (164118391).

1438894769 is a wasteful number, since it uses less digits than its factorization.

1438894769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3816739.

The product of its digits is 10450944, while the sum is 59.

The square root of 1438894769 is about 37932.7664295659. The cubic root of 1438894769 is about 1128.9542545476.

The spelling of 1438894769 in words is "one billion, four hundred thirty-eight million, eight hundred ninety-four thousand, seven hundred sixty-nine".