1438981650 has 72 divisors (see below), whose sum is σ = 3873679524. Its totient is φ = 382972800.

The previous prime is 1438981631. The next prime is 1438981651. The reversal of 1438981650 is 561898341.

It can be written as a sum of positive squares in 6 ways, for example, as 219365721 + 1219615929 = 14811^2 + 34923^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 1438981596 and 1438981605.

It is not an unprimeable number, because it can be changed into a prime (1438981651) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 247780 + ... + 253520.

Almost surely, 2^1438981650 is an apocalyptic number.

1438981650 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 1438981650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1936839762).

1438981650 is an abundant number, since it is smaller than the sum of its proper divisors (2434697874).

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

1438981650 is a wasteful number, since it uses less digits than its factorization.

1438981650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6316 (or 6308 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 1438981650 is about 37933.9116095348. The cubic root of 1438981650 is about 1128.9769763158.

The spelling of 1438981650 in words is "one billion, four hundred thirty-eight million, nine hundred eighty-one thousand, six hundred fifty".