145665738 has 12 divisors (see below), whose sum is σ = 315609138. Its totient is φ = 48555240.

The previous prime is 145665731. The next prime is 145665757. The reversal of 145665738 is 837566541.

145665738 is a `hidden beast` number, since 1 + 4 + 566 + 57 + 38 = 666.

It can be written as a sum of positive squares in only one way, i.e., 145515969 + 149769 = 12063^2 + 387^2 .

It is a junction number, because it is equal to n+sod(n) for n = 145665693 and 145665702.

It is not an unprimeable number, because it can be changed into a prime (145665731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4046253 + ... + 4046288.

Almost surely, 2^145665738 is an apocalyptic number.

145665738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

145665738 is an abundant number, since it is smaller than the sum of its proper divisors (169943400).

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

145665738 is a wasteful number, since it uses less digits than its factorization.

145665738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8092549 (or 8092546 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 145665738 is about 12069.2061876496. The cubic root of 145665738 is about 526.1615858672.

The spelling of 145665738 in words is "one hundred forty-five million, six hundred sixty-five thousand, seven hundred thirty-eight".