145990709 has 8 divisors (see below), whose sum is σ = 149710680. Its totient is φ = 142278400.

The previous prime is 145990703. The next prime is 145990739. The reversal of 145990709 is 907099541.

It can be written as a sum of positive squares in 4 ways, for example, as 305809 + 145684900 = 553^2 + 12070^2 .

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 145990709 - 2¹⁶ = 145925173 is a prime.

It is a super-2 number, since 2×145990709² = 42626574228645362, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 145990709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145990703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69527 + ... + 71595.

It is an arithmetic number, because the mean of its divisors is an integer number (18713835).

Almost surely, 2^145990709 is an apocalyptic number.

It is an amenable number.

145990709 is a deficient number, since it is larger than the sum of its proper divisors (3719971).

145990709 is a wasteful number, since it uses less digits than its factorization.

145990709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3831.

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 145990709 is about 12082.6615031623. The cubic root of 145990709 is about 526.5525729370.

The spelling of 145990709 in words is "one hundred forty-five million, nine hundred ninety thousand, seven hundred nine".