138964020 has 96 divisors (see below), whose sum is σ = 421986432. Its totient is φ = 33965568.

The previous prime is 138964019. The next prime is 138964031. The reversal of 138964020 is 20469831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126594 + ... + 127686.

It is an arithmetic number, because the mean of its divisors is an integer number (4395692).

Almost surely, 2^138964020 is an apocalyptic number.

138964020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138964020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210993216).

138964020 is an abundant number, since it is smaller than the sum of its proper divisors (283022412).

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

138964020 is a wasteful number, since it uses less digits than its factorization.

138964020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281 (or 1279 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 138964020 is about 11788.3001319105. The cubic root of 138964020 is about 517.9654474252.

The spelling of 138964020 in words is "one hundred thirty-eight million, nine hundred sixty-four thousand, twenty".