139638720 has 224 divisors, whose sum is σ = 487484928. Its totient is φ = 33656832.

The previous prime is 139638713. The next prime is 139638767. The reversal of 139638720 is 27836931.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 836077 + ... + 836243.

It is an arithmetic number, because the mean of its divisors is an integer number (2176272).

Almost surely, 2^139638720 is an apocalyptic number.

139638720 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 139638720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243742464).

139638720 is an abundant number, since it is smaller than the sum of its proper divisors (347846208).

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

139638720 is a wasteful number, since it uses less digits than its factorization.

139638720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 139638720 is about 11816.8828377030. The cubic root of 139638720 is about 518.8023720289.

The spelling of 139638720 in words is "one hundred thirty-nine million, six hundred thirty-eight thousand, seven hundred twenty".