145421238 has 16 divisors (see below), whose sum is σ = 291012336. Its totient is φ = 48445440.

The previous prime is 145421233. The next prime is 145421251. The reversal of 145421238 is 832124541.

It is a super-2 number, since 2×145421238² = 42294672922905288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145421233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5878 + ... + 18038.

It is an arithmetic number, because the mean of its divisors is an integer number (18188271).

Almost surely, 2^145421238 is an apocalyptic number.

145421238 is an abundant number, since it is smaller than the sum of its proper divisors (145591098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

145421238 is a wasteful number, since it uses less digits than its factorization.

145421238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14159.

The product of its digits is 7680, while the sum is 30.

The square root of 145421238 is about 12059.0728499334. The cubic root of 145421238 is about 525.8670335256.

Adding to 145421238 its reverse (832124541), we get a palindrome (977545779).

The spelling of 145421238 in words is "one hundred forty-five million, four hundred twenty-one thousand, two hundred thirty-eight".