145806993 has 8 divisors (see below), whose sum is σ = 216010400. Its totient is φ = 97204644.

The previous prime is 145806979. The next prime is 145807001. The reversal of 145806993 is 399608541.

It is a happy number.

145806993 is a `hidden beast` number, since 1 + 4 + 580 + 69 + 9 + 3 = 666.

It is not a de Polignac number, because 145806993 - 2⁶ = 145806929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145806293) 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, 2700103 + ... + 2700156.

It is an arithmetic number, because the mean of its divisors is an integer number (27001300).

Almost surely, 2^145806993 is an apocalyptic number.

It is an amenable number.

145806993 is a deficient number, since it is larger than the sum of its proper divisors (70203407).

145806993 is an equidigital number, since it uses as much as digits as its factorization.

145806993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5400268 (or 5400262 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 145806993 is about 12075.0566458299. The cubic root of 145806993 is about 526.3316074171.

The spelling of 145806993 in words is "one hundred forty-five million, eight hundred six thousand, nine hundred ninety-three".