138626465 has 8 divisors (see below), whose sum is σ = 169079208. Its totient is φ = 109082880.

The previous prime is 138626443. The next prime is 138626473. The reversal of 138626465 is 564626831.

It can be written as a sum of positive squares in 4 ways, for example, as 516961 + 138109504 = 719^2 + 11752^2 .

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

It is not a de Polignac number, because 138626465 - 2⁶ = 138626401 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226952 + ... + 227561.

It is an arithmetic number, because the mean of its divisors is an integer number (21134901).

Almost surely, 2^138626465 is an apocalyptic number.

It is an amenable number.

138626465 is a deficient number, since it is larger than the sum of its proper divisors (30452743).

138626465 is an equidigital number, since it uses as much as digits as its factorization.

138626465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454579.

The product of its digits is 207360, while the sum is 41.

The square root of 138626465 is about 11773.9740529695. The cubic root of 138626465 is about 517.5457138703.

The spelling of 138626465 in words is "one hundred thirty-eight million, six hundred twenty-six thousand, four hundred sixty-five".