145724817 has 8 divisors (see below), whose sum is σ = 222056896. Its totient is φ = 83271312.

The previous prime is 145724801. The next prime is 145724819. The reversal of 145724817 is 718427541.

145724817 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 not a de Polignac number, because 145724817 - 2⁴ = 145724801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145724819) 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, 3469618 + ... + 3469659.

It is an arithmetic number, because the mean of its divisors is an integer number (27757112).

Almost surely, 2^145724817 is an apocalyptic number.

It is an amenable number.

145724817 is a deficient number, since it is larger than the sum of its proper divisors (76332079).

145724817 is an equidigital number, since it uses as much as digits as its factorization.

145724817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6939287.

The product of its digits is 62720, while the sum is 39.

The square root of 145724817 is about 12071.6534493001. The cubic root of 145724817 is about 526.2327096589.

The spelling of 145724817 in words is "one hundred forty-five million, seven hundred twenty-four thousand, eight hundred seventeen".