145640123 has 4 divisors (see below), whose sum is σ = 148027728. Its totient is φ = 143252520.

The previous prime is 145640119. The next prime is 145640137. The reversal of 145640123 is 321046541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321046541 = 2083 ⋅154127.

It is a cyclic number.

It is not a de Polignac number, because 145640123 - 2² = 145640119 is a prime.

It is a super-2 number, since 2×145640123² = 42422090854910258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145640092 and 145640101.

It is not an unprimeable number, because it can be changed into a prime (145640723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1193711 + ... + 1193832.

It is an arithmetic number, because the mean of its divisors is an integer number (37006932).

Almost surely, 2^145640123 is an apocalyptic number.

145640123 is a deficient number, since it is larger than the sum of its proper divisors (2387605).

145640123 is an equidigital number, since it uses as much as digits as its factorization.

145640123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2387604.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 145640123 is about 12068.1449692983. The cubic root of 145640123 is about 526.1307426063.

Adding to 145640123 its reverse (321046541), we get a palindrome (466686664).

The spelling of 145640123 in words is "one hundred forty-five million, six hundred forty thousand, one hundred twenty-three".