1138721240 has 32 divisors (see below), whose sum is σ = 2605554000. Its totient is φ = 447767424.

The previous prime is 1138721219. The next prime is 1138721257. The reversal of 1138721240 is 421278311.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238895 + ... + 243614.

Almost surely, 2^1138721240 is an apocalyptic number.

1138721240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1138721240 is an abundant number, since it is smaller than the sum of its proper divisors (1466832760).

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

1138721240 is a wasteful number, since it uses less digits than its factorization.

1138721240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482579 (or 482575 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 1138721240 is about 33744.9439175708. The cubic root of 1138721240 is about 1044.2531815996.

Adding to 1138721240 its reverse (421278311), we get a palindrome (1559999551).

The spelling of 1138721240 in words is "one billion, one hundred thirty-eight million, seven hundred twenty-one thousand, two hundred forty".