145402238 has 4 divisors (see below), whose sum is σ = 218103360. Its totient is φ = 72701118.

The previous prime is 145402217. The next prime is 145402273. The reversal of 145402238 is 832204541.

It is a happy number.

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

It is a super-2 number, since 2×145402238² = 42283621630817288, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 145402238.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36350558 + ... + 36350561.

It is an arithmetic number, because the mean of its divisors is an integer number (54525840).

Almost surely, 2^145402238 is an apocalyptic number.

145402238 is a deficient number, since it is larger than the sum of its proper divisors (72701122).

145402238 is an equidigital number, since it uses as much as digits as its factorization.

145402238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72701121.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 145402238 is about 12058.2850356093. The cubic root of 145402238 is about 525.8441301566.

Adding to 145402238 its reverse (832204541), we get a palindrome (977606779).

The spelling of 145402238 in words is "one hundred forty-five million, four hundred two thousand, two hundred thirty-eight".