145172893 has 4 divisors (see below), whose sum is σ = 146922048. Its totient is φ = 143423740.

The previous prime is 145172879. The next prime is 145172897. The reversal of 145172893 is 398271541.

145172893 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145172893 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145172897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 874453 + ... + 874618.

It is an arithmetic number, because the mean of its divisors is an integer number (36730512).

Almost surely, 2^145172893 is an apocalyptic number.

It is an amenable number.

145172893 is a deficient number, since it is larger than the sum of its proper divisors (1749155).

145172893 is an equidigital number, since it uses as much as digits as its factorization.

145172893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749154.

The product of its digits is 60480, while the sum is 40.

The square root of 145172893 is about 12048.7714311460. The cubic root of 145172893 is about 525.5675108803.

The spelling of 145172893 in words is "one hundred forty-five million, one hundred seventy-two thousand, eight hundred ninety-three".