1238742440 has 64 divisors (see below), whose sum is σ = 3010210560. Its totient is φ = 456065280.

The previous prime is 1238742437. The next prime is 1238742457. The reversal of 1238742440 is 442478321.

It is a self number, because there is not a number n which added to its sum of digits gives 1238742440.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187595 + ... + 194085.

It is an arithmetic number, because the mean of its divisors is an integer number (47034540).

Almost surely, 2^1238742440 is an apocalyptic number.

1238742440 is a gapful number since it is divisible by the number (10) 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 1238742440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1505105280).

1238742440 is an abundant number, since it is smaller than the sum of its proper divisors (1771468120).

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

1238742440 is a wasteful number, since it uses less digits than its factorization.

1238742440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6882 (or 6878 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 35.

The square root of 1238742440 is about 35195.7730416594. The cubic root of 1238742440 is about 1073.9737644541.

The spelling of 1238742440 in words is "one billion, two hundred thirty-eight million, seven hundred forty-two thousand, four hundred forty".