145709689 has 8 divisors (see below), whose sum is σ = 153489440. Its totient is φ = 137941056.

The previous prime is 145709687. The next prime is 145709693. The reversal of 145709689 is 986907541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145709689 - 2¹ = 145709687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145709687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50017 + ... + 52849.

It is an arithmetic number, because the mean of its divisors is an integer number (19186180).

Almost surely, 2^145709689 is an apocalyptic number.

145709689 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

145709689 is a deficient number, since it is larger than the sum of its proper divisors (7779751).

145709689 is a wasteful number, since it uses less digits than its factorization.

145709689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5559.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 145709689 is about 12071.0268411598. The cubic root of 145709689 is about 526.2144992536.

The spelling of 145709689 in words is "one hundred forty-five million, seven hundred nine thousand, six hundred eighty-nine".