145734721 has 8 divisors (see below), whose sum is σ = 159937344. Its totient is φ = 131691120.

The previous prime is 145734713. The next prime is 145734793. The reversal of 145734721 is 127437541.

145734721 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 145734721 - 2³ = 145734713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145734521) 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, 37830 + ... + 41503.

It is an arithmetic number, because the mean of its divisors is an integer number (19992168).

Almost surely, 2^145734721 is an apocalyptic number.

145734721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

145734721 is a deficient number, since it is larger than the sum of its proper divisors (14202623).

145734721 is a wasteful number, since it uses less digits than its factorization.

145734721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79511.

The product of its digits is 23520, while the sum is 34.

The square root of 145734721 is about 12072.0636595406. The cubic root of 145734721 is about 526.2446309655.

The spelling of 145734721 in words is "one hundred forty-five million, seven hundred thirty-four thousand, seven hundred twenty-one".