1438946658 has 18 divisors (see below), whose sum is σ = 3118066497. Its totient is φ = 479595240.

The previous prime is 1438946609. The next prime is 1438946683. The reversal of 1438946658 is 8566498341.

It can be written as a sum of positive squares in 2 ways, for example, as 1401528969 + 37417689 = 37437^2 + 6117^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=26823.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 156468 + ... + 165408.

Almost surely, 2^1438946658 is an apocalyptic number.

1438946658 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1438946658 is an abundant number, since it is smaller than the sum of its proper divisors (1679119839).

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

1438946658 is an frugal number, since it uses more digits than its factorization.

1438946658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17890 (or 8946 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 1438946658 is about 37933.4503835335. The cubic root of 1438946658 is about 1128.9678250566.

The spelling of 1438946658 in words is "one billion, four hundred thirty-eight million, nine hundred forty-six thousand, six hundred fifty-eight".