139007640 has 64 divisors (see below), whose sum is σ = 441560160. Its totient is φ = 34887680.

The previous prime is 139007621. The next prime is 139007651. The reversal of 139007640 is 46700931.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 139007598 and 139007607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32031 + ... + 36110.

Almost surely, 2^139007640 is an apocalyptic number.

139007640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139007640 is an abundant number, since it is smaller than the sum of its proper divisors (302552520).

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

139007640 is a wasteful number, since it uses less digits than its factorization.

139007640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68172 (or 68168 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 139007640 is about 11790.1501262707. The cubic root of 139007640 is about 518.0196372057.

The spelling of 139007640 in words is "one hundred thirty-nine million, seven thousand, six hundred forty".