139542426 has 80 divisors (see below), whose sum is σ = 345622464. Its totient is φ = 41855616.

The previous prime is 139542421. The next prime is 139542427. The reversal of 139542426 is 624245931.

It is a happy number.

139542426 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (139542421) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 62241 + ... + 64443.

Almost surely, 2^139542426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139542426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172811232).

139542426 is an abundant number, since it is smaller than the sum of its proper divisors (206080038).

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

139542426 is a wasteful number, since it uses less digits than its factorization.

139542426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2257 (or 2248 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 139542426 is about 11812.8077102779. The cubic root of 139542426 is about 518.6830903008.

The spelling of 139542426 in words is "one hundred thirty-nine million, five hundred forty-two thousand, four hundred twenty-six".