1838638657 has 8 divisors (see below), whose sum is σ = 1908244800. Its totient is φ = 1769446224.

The previous prime is 1838638639. The next prime is 1838638661. The reversal of 1838638657 is 7568368381.

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

It is a cyclic number.

It is not a de Polignac number, because 1838638657 - 2²⁷ = 1704420929 is a prime.

It is a super-2 number, since 2×1838638657² = 6761184222029527298, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1838638598 and 1838638607.

It is not an unprimeable number, because it can be changed into a prime (1838638667) 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, 94357 + ... + 112162.

It is an arithmetic number, because the mean of its divisors is an integer number (238530600).

Almost surely, 2^1838638657 is an apocalyptic number.

It is an amenable number.

1838638657 is a deficient number, since it is larger than the sum of its proper divisors (69606143).

1838638657 is a wasteful number, since it uses less digits than its factorization.

1838638657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206855.

The product of its digits is 5806080, while the sum is 55.

The square root of 1838638657 is about 42879.3500067340. The cubic root of 1838638657 is about 1225.0828558701.

The spelling of 1838638657 in words is "one billion, eight hundred thirty-eight million, six hundred thirty-eight thousand, six hundred fifty-seven".