145903493 has 4 divisors (see below), whose sum is σ = 146968620. Its totient is φ = 144838368.

The previous prime is 145903481. The next prime is 145903523. The reversal of 145903493 is 394309541.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37368769 + 108534724 = 6113^2 + 10418^2 .

It is a cyclic number.

It is not a de Polignac number, because 145903493 - 2¹⁰ = 145902469 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 (145903993) 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 3 ways as a sum of consecutive naturals, for example, 532358 + ... + 532631.

It is an arithmetic number, because the mean of its divisors is an integer number (36742155).

Almost surely, 2^145903493 is an apocalyptic number.

It is an amenable number.

145903493 is a deficient number, since it is larger than the sum of its proper divisors (1065127).

145903493 is a wasteful number, since it uses less digits than its factorization.

145903493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065126.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 145903493 is about 12079.0518253711. The cubic root of 145903493 is about 526.4476964974.

The spelling of 145903493 in words is "one hundred forty-five million, nine hundred three thousand, four hundred ninety-three".