1440069138 has 16 divisors (see below), whose sum is σ = 3200153760. Its totient is φ = 480023028.

The previous prime is 1440069131. The next prime is 1440069157. The reversal of 1440069138 is 8319600441.

It is not an unprimeable number, because it can be changed into a prime (1440069131) 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, 13333920 + ... + 13334027.

It is an arithmetic number, because the mean of its divisors is an integer number (200009610).

Almost surely, 2^1440069138 is an apocalyptic number.

1440069138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1440069138 is an abundant number, since it is smaller than the sum of its proper divisors (1760084622).

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

1440069138 is a wasteful number, since it uses less digits than its factorization.

1440069138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26667958 (or 26667952 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 1440069138 is about 37948.2428842232. The cubic root of 1440069138 is about 1129.2613069649.

Adding to 1440069138 its reverse (8319600441), we get a palindrome (9759669579).

It can be divided in two parts, 14400 and 69138, that added together give a palindrome (83538).

The spelling of 1440069138 in words is "one billion, four hundred forty million, sixty-nine thousand, one hundred thirty-eight".