139268640 has 192 divisors, whose sum is σ = 506338560. Its totient is φ = 31518720.

The previous prime is 139268639. The next prime is 139268653. The reversal of 139268640 is 46862931.

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, 608046 + ... + 608274.

It is an arithmetic number, because the mean of its divisors is an integer number (2637180).

Almost surely, 2^139268640 is an apocalyptic number.

139268640 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 139268640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253169280).

139268640 is an abundant number, since it is smaller than the sum of its proper divisors (367069920).

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

139268640 is a wasteful number, since it uses less digits than its factorization.

139268640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 139268640 is about 11801.2134969248. The cubic root of 139268640 is about 518.3436448036.

The spelling of 139268640 in words is "one hundred thirty-nine million, two hundred sixty-eight thousand, six hundred forty".