245620138 has 8 divisors (see below), whose sum is σ = 368911620. Its totient is φ = 122649600.

The previous prime is 245620121. The next prime is 245620139. The reversal of 245620138 is 831026542.

It can be written as a sum of positive squares in 2 ways, for example, as 245016409 + 603729 = 15653^2 + 777^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×245620138² = 120658504382278088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (245620139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78313 + ... + 81388.

Almost surely, 2^245620138 is an apocalyptic number.

245620138 is a deficient number, since it is larger than the sum of its proper divisors (123291482).

245620138 is a wasteful number, since it uses less digits than its factorization.

245620138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160472.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 245620138 is about 15672.2729047193. The cubic root of 245620138 is about 626.2599759899.

The spelling of 245620138 in words is "two hundred forty-five million, six hundred twenty thousand, one hundred thirty-eight".