138498643 has 8 divisors (see below), whose sum is σ = 147718512. Its totient is φ = 129398016.

The previous prime is 138498631. The next prime is 138498667. The reversal of 138498643 is 346894831.

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

It is not a de Polignac number, because 138498643 - 2⁹ = 138498131 is a prime.

It is a super-2 number, since 2×138498643² = 38363748225682898, 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 = 138498593 and 138498602.

It is not an unprimeable number, because it can be changed into a prime (138498623) 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, 27405 + ... + 32062.

It is an arithmetic number, because the mean of its divisors is an integer number (18464814).

Almost surely, 2^138498643 is an apocalyptic number.

138498643 is a deficient number, since it is larger than the sum of its proper divisors (9219869).

138498643 is a wasteful number, since it uses less digits than its factorization.

138498643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59621.

The product of its digits is 497664, while the sum is 46.

The square root of 138498643 is about 11768.5446423931. The cubic root of 138498643 is about 517.3865954527.

The spelling of 138498643 in words is "one hundred thirty-eight million, four hundred ninety-eight thousand, six hundred forty-three".