138940000 has 60 divisors (see below), whose sum is σ = 341862444. Its totient is φ = 55568000.

The previous prime is 138939937. The next prime is 138940003. The reversal of 138940000 is 49831.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138940003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 16527 + ... + 23473.

Almost surely, 2^138940000 is an apocalyptic number.

138940000 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 138940000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170931222).

138940000 is an abundant number, since it is smaller than the sum of its proper divisors (202922444).

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

138940000 is an frugal number, since it uses more digits than its factorization.

138940000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6977 (or 6954 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 138940000 is about 11787.2812811097. The cubic root of 138940000 is about 517.9356021771.

Adding to 138940000 its reverse (49831), we get a palindrome (138989831).

The spelling of 138940000 in words is "one hundred thirty-eight million, nine hundred forty thousand".