139809424 has 10 divisors (see below), whose sum is σ = 270880790. Its totient is φ = 69904704.

The previous prime is 139809413. The next prime is 139809427. The reversal of 139809424 is 424908931.

It can be written as a sum of positive squares in only one way, i.e., 131515024 + 8294400 = 11468^2 + 2880^2 .

It is not an unprimeable number, because it can be changed into a prime (139809427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4369029 + ... + 4369060.

It is an arithmetic number, because the mean of its divisors is an integer number (27088079).

Almost surely, 2^139809424 is an apocalyptic number.

It is an amenable number.

139809424 is a deficient number, since it is larger than the sum of its proper divisors (131071366).

139809424 is an equidigital number, since it uses as much as digits as its factorization.

139809424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8738097 (or 8738091 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 139809424 is about 11824.1035178148. The cubic root of 139809424 is about 519.0136925391.

The spelling of 139809424 in words is "one hundred thirty-nine million, eight hundred nine thousand, four hundred twenty-four".