139500000 has 252 divisors, whose sum is σ = 511868448. Its totient is φ = 36000000.

The previous prime is 139499993. The next prime is 139500061. The reversal of 139500000 is 5931.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 4499985 + ... + 4500015.

It is an arithmetic number, because the mean of its divisors is an integer number (2031224).

Almost surely, 2^139500000 is an apocalyptic number.

139500000 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 139500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255934224).

139500000 is an abundant number, since it is smaller than the sum of its proper divisors (372368448).

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

139500000 is an frugal number, since it uses more digits than its factorization.

139500000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 135, while the sum is 18.

The square root of 139500000 is about 11811.0118110177. The cubic root of 139500000 is about 518.6305187641.

Adding to 139500000 its reverse (5931), we get a palindrome (139505931).

The spelling of 139500000 in words is "one hundred thirty-nine million, five hundred thousand".