139238424 has 72 divisors (see below), whose sum is σ = 408379140. Its totient is φ = 42838848.

The previous prime is 139238399. The next prime is 139238431. The reversal of 139238424 is 424832931.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6447 + ... + 17889.

Almost surely, 2^139238424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139238424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204189570).

139238424 is an abundant number, since it is smaller than the sum of its proper divisors (269140716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139238424 is a wasteful number, since it uses less digits than its factorization.

139238424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11481 (or 11461 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 139238424 is about 11799.9332201500. The cubic root of 139238424 is about 518.3061551375.

The spelling of 139238424 in words is "one hundred thirty-nine million, two hundred thirty-eight thousand, four hundred twenty-four".