145173987 has 12 divisors (see below), whose sum is σ = 239652400. Its totient is φ = 82956528.

The previous prime is 145173947. The next prime is 145173997. The reversal of 145173987 is 789371541.

It is not a de Polignac number, because 145173987 - 2¹⁸ = 144911843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145173947) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1152112 + ... + 1152237.

Almost surely, 2^145173987 is an apocalyptic number.

145173987 is a deficient number, since it is larger than the sum of its proper divisors (94478413).

145173987 is a wasteful number, since it uses less digits than its factorization.

145173987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2304362 (or 2304359 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 145173987 is about 12048.8168298800. The cubic root of 145173987 is about 525.5688310749.

The spelling of 145173987 in words is "one hundred forty-five million, one hundred seventy-three thousand, nine hundred eighty-seven".