145240442 has 4 divisors (see below), whose sum is σ = 217860666. Its totient is φ = 72620220.

The previous prime is 145240441. The next prime is 145240457. The reversal of 145240442 is 244042541.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 98029801 + 47210641 = 9901^2 + 6871^2 .

It is not an unprimeable number, because it can be changed into a prime (145240441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36310109 + ... + 36310112.

Almost surely, 2^145240442 is an apocalyptic number.

145240442 is a deficient number, since it is larger than the sum of its proper divisors (72620224).

145240442 is an equidigital number, since it uses as much as digits as its factorization.

145240442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72620223.

The product of its (nonzero) digits is 5120, while the sum is 26.

The square root of 145240442 is about 12051.5742540135. The cubic root of 145240442 is about 525.6490138253.

Adding to 145240442 its reverse (244042541), we get a palindrome (389282983).

The spelling of 145240442 in words is "one hundred forty-five million, two hundred forty thousand, four hundred forty-two".