138942000 has 320 divisors, whose sum is σ = 519966720. Its totient is φ = 35424000.

The previous prime is 138941983. The next prime is 138942019. The reversal of 138942000 is 249831.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1673959 + ... + 1674041.

It is an arithmetic number, because the mean of its divisors is an integer number (1624896).

Almost surely, 2^138942000 is an apocalyptic number.

138942000 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 138942000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259983360).

138942000 is an abundant number, since it is smaller than the sum of its proper divisors (381024720).

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

138942000 is a wasteful number, since it uses less digits than its factorization.

138942000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 138942000 is about 11787.3661180096. The cubic root of 138942000 is about 517.9380873415.

The spelling of 138942000 in words is "one hundred thirty-eight million, nine hundred forty-two thousand".