145243642 has 4 divisors (see below), whose sum is σ = 217865466. Its totient is φ = 72621820.

The previous prime is 145243627. The next prime is 145243661. The reversal of 145243642 is 246342541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 246342541 = 4421 ⋅55721.

It can be written as a sum of positive squares in only one way, i.e., 95667961 + 49575681 = 9781^2 + 7041^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36310909 + ... + 36310912.

Almost surely, 2^145243642 is an apocalyptic number.

145243642 is a deficient number, since it is larger than the sum of its proper divisors (72621824).

145243642 is an equidigital number, since it uses as much as digits as its factorization.

145243642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72621823.

The product of its digits is 23040, while the sum is 31.

The square root of 145243642 is about 12051.7070160206. The cubic root of 145243642 is about 525.6528742388.

The spelling of 145243642 in words is "one hundred forty-five million, two hundred forty-three thousand, six hundred forty-two".