139420550 has 24 divisors (see below), whose sum is σ = 259637400. Its totient is φ = 55700480.

The previous prime is 139420531. The next prime is 139420559. The reversal of 139420550 is 55024931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139420559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69461 + ... + 71439.

It is an arithmetic number, because the mean of its divisors is an integer number (10818225).

Almost surely, 2^139420550 is an apocalyptic number.

139420550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139420550 is a deficient number, since it is larger than the sum of its proper divisors (120216850).

139420550 is a wasteful number, since it uses less digits than its factorization.

139420550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3400 (or 3395 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 139420550 is about 11807.6479452938. The cubic root of 139420550 is about 518.5320408196.

The spelling of 139420550 in words is "one hundred thirty-nine million, four hundred twenty thousand, five hundred fifty".