145215399 has 32 divisors (see below), whose sum is σ = 236565504. Its totient is φ = 77425920.

The previous prime is 145215391. The next prime is 145215401. The reversal of 145215399 is 993512541.

It is not a de Polignac number, because 145215399 - 2³ = 145215391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145215391) 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 31 ways as a sum of consecutive naturals, for example, 16137 + ... + 23469.

It is an arithmetic number, because the mean of its divisors is an integer number (7392672).

Almost surely, 2^145215399 is an apocalyptic number.

145215399 is a deficient number, since it is larger than the sum of its proper divisors (91350105).

145215399 is a wasteful number, since it uses less digits than its factorization.

145215399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7407.

The product of its digits is 48600, while the sum is 39.

The square root of 145215399 is about 12050.5352163296. The cubic root of 145215399 is about 525.6188005120.

The spelling of 145215399 in words is "one hundred forty-five million, two hundred fifteen thousand, three hundred ninety-nine".