139538420 has 24 divisors (see below), whose sum is σ = 334892544. Its totient is φ = 47841696.

The previous prime is 139538419. The next prime is 139538423. The reversal of 139538420 is 24835931.

139538420 is digitally balanced in base 2, base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (35).

139538420 is strictly pandigital in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139538423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 498212 + ... + 498491.

It is an arithmetic number, because the mean of its divisors is an integer number (13953856).

Almost surely, 2^139538420 is an apocalyptic number.

139538420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139538420 is an abundant number, since it is smaller than the sum of its proper divisors (195354124).

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

139538420 is a wasteful number, since it uses less digits than its factorization.

139538420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996719 (or 996717 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 139538420 is about 11812.6381473403. The cubic root of 139538420 is about 518.6781267821.

The spelling of 139538420 in words is "one hundred thirty-nine million, five hundred thirty-eight thousand, four hundred twenty".