138645802 has 24 divisors (see below), whose sum is σ = 215661420. Its totient is φ = 66823680.

The previous prime is 138645799. The next prime is 138645809. The reversal of 138645802 is 208546831.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 14969161 + 123676641 = 3869^2 + 11121^2 .

It is not an unprimeable number, because it can be changed into a prime (138645809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1226898 + ... + 1227010.

Almost surely, 2^138645802 is an apocalyptic number.

138645802 is a deficient number, since it is larger than the sum of its proper divisors (77015618).

138645802 is an equidigital number, since it uses as much as digits as its factorization.

138645802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378 (or 265 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 138645802 is about 11774.7951999175. The cubic root of 138645802 is about 517.5697768951.

The spelling of 138645802 in words is "one hundred thirty-eight million, six hundred forty-five thousand, eight hundred two".