138420037 has 8 divisors (see below), whose sum is σ = 158852672. Its totient is φ = 118152000.

The previous prime is 138420019. The next prime is 138420043. The reversal of 138420037 is 730024831.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138420037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138419987 and 138420014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138420017) 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, 39339 + ... + 42712.

It is an arithmetic number, because the mean of its divisors is an integer number (19856584).

Almost surely, 2^138420037 is an apocalyptic number.

It is an amenable number.

138420037 is a deficient number, since it is larger than the sum of its proper divisors (20432635).

138420037 is an equidigital number, since it uses as much as digits as its factorization.

138420037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82299.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 138420037 is about 11765.2045031100. The cubic root of 138420037 is about 517.2886946445.

Adding to 138420037 its reverse (730024831), we get a palindrome (868444868).

The spelling of 138420037 in words is "one hundred thirty-eight million, four hundred twenty thousand, thirty-seven".