139867840 has 112 divisors (see below), whose sum is σ = 403140672. Its totient is φ = 45121536.

The previous prime is 139867837. The next prime is 139867843. The reversal of 139867840 is 48768931.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (139867837) and next prime (139867843).

It is a tau number, because it is divible by the number of its divisors (112).

It is not an unprimeable number, because it can be changed into a prime (139867843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36244 + ... + 39916.

Almost surely, 2^139867840 is an apocalyptic number.

139867840 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 139867840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201570336).

139867840 is an abundant number, since it is smaller than the sum of its proper divisors (263272832).

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

139867840 is a wasteful number, since it uses less digits than its factorization.

139867840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3714 (or 3704 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 139867840 is about 11826.5734682536. The cubic root of 139867840 is about 519.0859682635.

The spelling of 139867840 in words is "one hundred thirty-nine million, eight hundred sixty-seven thousand, eight hundred forty".