138897284 has 6 divisors (see below), whose sum is σ = 243070254. Its totient is φ = 69448640.

The previous prime is 138897271. The next prime is 138897287. The reversal of 138897284 is 482798831.

It can be written as a sum of positive squares in only one way, i.e., 132894784 + 6002500 = 11528^2 + 2450^2 .

It is not an unprimeable number, because it can be changed into a prime (138897287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17362157 + ... + 17362164.

It is an arithmetic number, because the mean of its divisors is an integer number (40511709).

Almost surely, 2^138897284 is an apocalyptic number.

It is an amenable number.

138897284 is a deficient number, since it is larger than the sum of its proper divisors (104172970).

138897284 is a wasteful number, since it uses less digits than its factorization.

138897284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34724325 (or 34724323 counting only the distinct ones).

The product of its digits is 774144, while the sum is 50.

The square root of 138897284 is about 11785.4691887935. The cubic root of 138897284 is about 517.8825183403.

The spelling of 138897284 in words is "one hundred thirty-eight million, eight hundred ninety-seven thousand, two hundred eighty-four".