145399042 has 4 divisors (see below), whose sum is σ = 218098566. Its totient is φ = 72699520.

The previous prime is 145399027. The next prime is 145399043. The reversal of 145399042 is 240993541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 240993541 = 733 ⋅328777.

It can be written as a sum of positive squares in only one way, i.e., 124523281 + 20875761 = 11159^2 + 4569^2 .

It is a super-3 number, since 3×145399042³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 145398992 and 145399010.

It is not an unprimeable number, because it can be changed into a prime (145399043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36349759 + ... + 36349762.

Almost surely, 2^145399042 is an apocalyptic number.

145399042 is a deficient number, since it is larger than the sum of its proper divisors (72699524).

145399042 is an equidigital number, since it uses as much as digits as its factorization.

145399042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72699523.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 145399042 is about 12058.1525118900. The cubic root of 145399042 is about 525.8402773728.

The spelling of 145399042 in words is "one hundred forty-five million, three hundred ninety-nine thousand, forty-two".