145173638 has 4 divisors (see below), whose sum is σ = 217760460. Its totient is φ = 72586818.

The previous prime is 145173617. The next prime is 145173649. The reversal of 145173638 is 836371541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 836371541 = 1697 ⋅492853.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36293408 + ... + 36293411.

It is an arithmetic number, because the mean of its divisors is an integer number (54440115).

Almost surely, 2^145173638 is an apocalyptic number.

145173638 is a deficient number, since it is larger than the sum of its proper divisors (72586822).

145173638 is an equidigital number, since it uses as much as digits as its factorization.

145173638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72586821.

The product of its digits is 60480, while the sum is 38.

The square root of 145173638 is about 12048.8023471215. The cubic root of 145173638 is about 525.5684099167.

The spelling of 145173638 in words is "one hundred forty-five million, one hundred seventy-three thousand, six hundred thirty-eight".