138902473 has 2 divisors, whose sum is σ = 138902474. Its totient is φ = 138902472.

The previous prime is 138902447. The next prime is 138902479. The reversal of 138902473 is 374209831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101545929 + 37356544 = 10077^2 + 6112^2 .

It is a cyclic number.

It is not a de Polignac number, because 138902473 - 2¹³ = 138894281 is a prime.

It is equal to p_7853617 and since 138902473 and 7853617 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (138902479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69451236 + 69451237.

It is an arithmetic number, because the mean of its divisors is an integer number (69451237).

Almost surely, 2^138902473 is an apocalyptic number.

It is an amenable number.

138902473 is a deficient number, since it is larger than the sum of its proper divisors (1).

138902473 is an equidigital number, since it uses as much as digits as its factorization.

138902473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 138902473 is about 11785.6893307095. The cubic root of 138902473 is about 517.8889673719. Note that the first 3 decimals are identical.

The spelling of 138902473 in words is "one hundred thirty-eight million, nine hundred two thousand, four hundred seventy-three".