139787840 has 56 divisors (see below), whose sum is σ = 340644480. Its totient is φ = 54609408.

The previous prime is 139787839. The next prime is 139787849. The reversal of 139787840 is 48787931.

It is not an unprimeable number, because it can be changed into a prime (139787849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8681 + ... + 18839.

Almost surely, 2^139787840 is an apocalyptic number.

139787840 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 139787840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170322240).

139787840 is an abundant number, since it is smaller than the sum of its proper divisors (200856640).

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

139787840 is a wasteful number, since it uses less digits than its factorization.

139787840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10219 (or 10209 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 139787840 is about 11823.1907706845. The cubic root of 139787840 is about 518.9869824463.

Subtracting from 139787840 its reverse (48787931), we obtain a palindrome (90999909).

The spelling of 139787840 in words is "one hundred thirty-nine million, seven hundred eighty-seven thousand, eight hundred forty".