138956450 has 12 divisors (see below), whose sum is σ = 258459090. Its totient is φ = 55582560.

The previous prime is 138956413. The next prime is 138956473. The reversal of 138956450 is 54659831.

It can be written as a sum of positive squares in 3 ways, for example, as 53042089 + 85914361 = 7283^2 + 9269^2 .

It is a junction number, because it is equal to n+sod(n) for n = 138956398 and 138956407.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1389515 + ... + 1389614.

Almost surely, 2^138956450 is an apocalyptic number.

138956450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138956450 is a deficient number, since it is larger than the sum of its proper divisors (119502640).

138956450 is a wasteful number, since it uses less digits than its factorization.

138956450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2779141 (or 2779136 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 138956450 is about 11787.9790464693. The cubic root of 138956450 is about 517.9560419459.

The spelling of 138956450 in words is "one hundred thirty-eight million, nine hundred fifty-six thousand, four hundred fifty".