138724898 has 16 divisors (see below), whose sum is σ = 224695296. Its totient is φ = 63855120.

The previous prime is 138724897. The next prime is 138724931. The reversal of 138724898 is 898427831.

It is a super-2 number, since 2×138724898² = 38489194650220808, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138724897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2993 + ... + 16923.

It is an arithmetic number, because the mean of its divisors is an integer number (14043456).

Almost surely, 2^138724898 is an apocalyptic number.

138724898 is a deficient number, since it is larger than the sum of its proper divisors (85970398).

138724898 is a wasteful number, since it uses less digits than its factorization.

138724898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14329.

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

The square root of 138724898 is about 11778.1534206343. The cubic root of 138724898 is about 517.6681809244.

The spelling of 138724898 in words is "one hundred thirty-eight million, seven hundred twenty-four thousand, eight hundred ninety-eight".