145660399 has 4 divisors (see below), whose sum is σ = 145685464. Its totient is φ = 145635336.

The previous prime is 145660397. The next prime is 145660409. The reversal of 145660399 is 993066541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993066541 = 1607 ⋅617963.

It is a cyclic number.

It is not a de Polignac number, because 145660399 - 2¹ = 145660397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145660391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1204 + ... + 17110.

It is an arithmetic number, because the mean of its divisors is an integer number (36421366).

Almost surely, 2^145660399 is an apocalyptic number.

145660399 is a deficient number, since it is larger than the sum of its proper divisors (25065).

145660399 is an equidigital number, since it uses as much as digits as its factorization.

145660399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25064.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 145660399 is about 12068.9850028907. The cubic root of 145660399 is about 526.1551574257.

The spelling of 145660399 in words is "one hundred forty-five million, six hundred sixty thousand, three hundred ninety-nine".