1438661250 has 200 divisors, whose sum is σ = 4342131948. Its totient is φ = 353808000.

The previous prime is 1438661233. The next prime is 1438661291. The reversal of 1438661250 is 521668341.

It is a happy number.

1438661250 is a `hidden beast` number, since 1 + 4 + 38 + 6 + 612 + 5 + 0 = 666.

It can be written as a sum of positive squares in 10 ways, for example, as 30835809 + 1407825441 = 5553^2 + 37521^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 99 ways as a sum of consecutive naturals, for example, 1315704 + ... + 1316796.

Almost surely, 2^1438661250 is an apocalyptic number.

1438661250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1438661250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2171065974).

1438661250 is an abundant number, since it is smaller than the sum of its proper divisors (2903470698).

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

1438661250 is a wasteful number, since it uses less digits than its factorization.

1438661250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140 (or 1116 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1438661250 is about 37929.6882402163. The cubic root of 1438661250 is about 1128.8931783806.

The spelling of 1438661250 in words is "one billion, four hundred thirty-eight million, six hundred sixty-one thousand, two hundred fifty".