145909397 has 4 divisors (see below), whose sum is σ = 146008620. Its totient is φ = 145810176.

The previous prime is 145909391. The next prime is 145909399. The reversal of 145909397 is 793909541.

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

It can be written as a sum of positive squares in 2 ways, for example, as 68574961 + 77334436 = 8281^2 + 8794^2 .

It is a cyclic number.

It is not a de Polignac number, because 145909397 - 2⁶ = 145909333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145909391) 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, 47372 + ... + 50357.

It is an arithmetic number, because the mean of its divisors is an integer number (36502155).

Almost surely, 2^145909397 is an apocalyptic number.

It is an amenable number.

145909397 is a deficient number, since it is larger than the sum of its proper divisors (99223).

145909397 is an equidigital number, since it uses as much as digits as its factorization.

145909397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99222.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 145909397 is about 12079.2962129422. The cubic root of 145909397 is about 526.4547973218.

The spelling of 145909397 in words is "one hundred forty-five million, nine hundred nine thousand, three hundred ninety-seven".