138820473 has 40 divisors (see below), whose sum is σ = 227383200. Its totient is φ = 83704320.

The previous prime is 138820471. The next prime is 138820481. The reversal of 138820473 is 374028831.

138820473 is a `hidden beast` number, since 1 + 388 + 204 + 73 = 666.

138820473 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138820473 - 2¹ = 138820471 is a prime.

It is a super-2 number, since 2×138820473² = 38542247447887458, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (138820471) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 308953 + ... + 309401.

It is an arithmetic number, because the mean of its divisors is an integer number (5684580).

Almost surely, 2^138820473 is an apocalyptic number.

It is an amenable number.

138820473 is a deficient number, since it is larger than the sum of its proper divisors (88562727).

138820473 is a wasteful number, since it uses less digits than its factorization.

138820473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819 (or 810 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 138820473 is about 11782.2100218932. The cubic root of 138820473 is about 517.7870367299.

The spelling of 138820473 in words is "one hundred thirty-eight million, eight hundred twenty thousand, four hundred seventy-three".