139781840 has 40 divisors (see below), whose sum is σ = 354539808. Its totient is φ = 50829440.

The previous prime is 139781813. The next prime is 139781843. The reversal of 139781840 is 48187931.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139781843) 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, 78542 + ... + 80301.

Almost surely, 2^139781840 is an apocalyptic number.

139781840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139781840 is an abundant number, since it is smaller than the sum of its proper divisors (214757968).

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

139781840 is a wasteful number, since it uses less digits than its factorization.

139781840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158867 (or 158861 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 139781840 is about 11822.9370293510. The cubic root of 139781840 is about 518.9795569877.

The spelling of 139781840 in words is "one hundred thirty-nine million, seven hundred eighty-one thousand, eight hundred forty".