145138493 has 8 divisors (see below), whose sum is σ = 146409120. Its totient is φ = 143872560.

The previous prime is 145138471. The next prime is 145138501. The reversal of 145138493 is 394831541.

145138493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145138493 - 2¹⁰ = 145137469 is a prime.

It is a super-2 number, since 2×145138493² = 42130364300622098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145138423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88838 + ... + 90456.

It is an arithmetic number, because the mean of its divisors is an integer number (18301140).

Almost surely, 2^145138493 is an apocalyptic number.

It is an amenable number.

145138493 is a deficient number, since it is larger than the sum of its proper divisors (1270627).

145138493 is a wasteful number, since it uses less digits than its factorization.

145138493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2347.

The product of its digits is 51840, while the sum is 38.

The square root of 145138493 is about 12047.3438151320. The cubic root of 145138493 is about 525.5259949788.

The spelling of 145138493 in words is "one hundred forty-five million, one hundred thirty-eight thousand, four hundred ninety-three".