1238744990 has 48 divisors (see below), whose sum is σ = 2597044032. Its totient is φ = 424178496.

The previous prime is 1238744939. The next prime is 1238744993. The reversal of 1238744990 is 994478321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1238744993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 774872 + ... + 776468.

It is an arithmetic number, because the mean of its divisors is an integer number (54105084).

Almost surely, 2^1238744990 is an apocalyptic number.

1238744990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1238744990 is an abundant number, since it is smaller than the sum of its proper divisors (1358299042).

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

1238744990 is a wasteful number, since it uses less digits than its factorization.

1238744990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3201 (or 3194 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 1238744990 is about 35195.8092675818. The cubic root of 1238744990 is about 1073.9745013926.

The spelling of 1238744990 in words is "one billion, two hundred thirty-eight million, seven hundred forty-four thousand, nine hundred ninety".