145720347 has 4 divisors (see below), whose sum is σ = 194293800. Its totient is φ = 97146896.

The previous prime is 145720321. The next prime is 145720349. The reversal of 145720347 is 743027541.

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

It is a cyclic number.

It is not a de Polignac number, because 145720347 - 2¹⁰ = 145719323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (145720349) 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, 24286722 + ... + 24286727.

It is an arithmetic number, because the mean of its divisors is an integer number (48573450).

Almost surely, 2^145720347 is an apocalyptic number.

145720347 is a deficient number, since it is larger than the sum of its proper divisors (48573453).

145720347 is an equidigital number, since it uses as much as digits as its factorization.

145720347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48573452.

The product of its (nonzero) digits is 23520, while the sum is 33.

The square root of 145720347 is about 12071.4683034004. The cubic root of 145720347 is about 526.2273290053.

Adding to 145720347 its reverse (743027541), we get a palindrome (888747888).

The spelling of 145720347 in words is "one hundred forty-five million, seven hundred twenty thousand, three hundred forty-seven".