145689238 has 4 divisors (see below), whose sum is σ = 218533860. Its totient is φ = 72844618.

The previous prime is 145689223. The next prime is 145689241. The reversal of 145689238 is 832986541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 832986541 = 463 ⋅1799107.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 36422308 + ... + 36422311.

It is an arithmetic number, because the mean of its divisors is an integer number (54633465).

Almost surely, 2^145689238 is an apocalyptic number.

145689238 is a deficient number, since it is larger than the sum of its proper divisors (72844622).

145689238 is an equidigital number, since it uses as much as digits as its factorization.

145689238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72844621.

The product of its digits is 414720, while the sum is 46.

The square root of 145689238 is about 12070.1797004021. The cubic root of 145689238 is about 526.1898792568.

The spelling of 145689238 in words is "one hundred forty-five million, six hundred eighty-nine thousand, two hundred thirty-eight".