145402438 has 4 divisors (see below), whose sum is σ = 218103660. Its totient is φ = 72701218.

The previous prime is 145402417. The next prime is 145402447. The reversal of 145402438 is 834204541.

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

It is a super-2 number, since 2×145402438² = 42283737952687688, which contains 22 as substring.

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 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, 36350608 + ... + 36350611.

It is an arithmetic number, because the mean of its divisors is an integer number (54525915).

Almost surely, 2^145402438 is an apocalyptic number.

145402438 is a deficient number, since it is larger than the sum of its proper divisors (72701222).

145402438 is an equidigital number, since it uses as much as digits as its factorization.

145402438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72701221.

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 145402438 is about 12058.2933286597. The cubic root of 145402438 is about 525.8443712551.

Adding to 145402438 its reverse (834204541), we get a palindrome (979606979).

The spelling of 145402438 in words is "one hundred forty-five million, four hundred two thousand, four hundred thirty-eight".