138903473 has 2 divisors, whose sum is σ = 138903474. Its totient is φ = 138903472.

The previous prime is 138903461. The next prime is 138903487. The reversal of 138903473 is 374309831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77563249 + 61340224 = 8807^2 + 7832^2 .

It is a cyclic number.

It is not a de Polignac number, because 138903473 - 2¹² = 138899377 is a prime.

It is a super-2 number, since 2×138903473² = 38588349622923458, which contains 22 as substring.

It is equal to p_7853663 and since 138903473 and 7853663 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 (138902473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69451736 + 69451737.

It is an arithmetic number, because the mean of its divisors is an integer number (69451737).

Almost surely, 2^138903473 is an apocalyptic number.

It is an amenable number.

138903473 is a deficient number, since it is larger than the sum of its proper divisors (1).

138903473 is an equidigital number, since it uses as much as digits as its factorization.

138903473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 138903473 is about 11785.7317549654. The cubic root of 138903473 is about 517.8902101809.

The spelling of 138903473 in words is "one hundred thirty-eight million, nine hundred three thousand, four hundred seventy-three".