1438999650 has 72 divisors (see below), whose sum is σ = 4217591664. Its totient is φ = 348847200.

The previous prime is 1438999609. The next prime is 1438999693. The reversal of 1438999650 is 569998341.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 140404 + ... + 150303.

It is an arithmetic number, because the mean of its divisors is an integer number (58577662).

Almost surely, 2^1438999650 is an apocalyptic number.

1438999650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1438999650 is an abundant number, since it is smaller than the sum of its proper divisors (2778592014).

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

1438999650 is a wasteful number, since it uses less digits than its factorization.

1438999650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290736 (or 290728 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The square root of 1438999650 is about 37934.1488635240. The cubic root of 1438999650 is about 1128.9816836960.

The spelling of 1438999650 in words is "one billion, four hundred thirty-eight million, nine hundred ninety-nine thousand, six hundred fifty".