1438777812 has 96 divisors (see below), whose sum is σ = 3680409600. Its totient is φ = 435722112.

The previous prime is 1438777787. The next prime is 1438777843. The reversal of 1438777812 is 2187778341.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1103553 + ... + 1104855.

It is an arithmetic number, because the mean of its divisors is an integer number (38337600).

Almost surely, 2^1438777812 is an apocalyptic number.

1438777812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1438777812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1840204800).

1438777812 is an abundant number, since it is smaller than the sum of its proper divisors (2241631788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1438777812 is a wasteful number, since it uses less digits than its factorization.

1438777812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1525 (or 1523 counting only the distinct ones).

The product of its digits is 526848, while the sum is 48.

The square root of 1438777812 is about 37931.2247627202. The cubic root of 1438777812 is about 1128.9236656346.

The spelling of 1438777812 in words is "one billion, four hundred thirty-eight million, seven hundred seventy-seven thousand, eight hundred twelve".