139185540 has 144 divisors (see below), whose sum is σ = 471726528. Its totient is φ = 34245504.

The previous prime is 139185533. The next prime is 139185551. The reversal of 139185540 is 45581931.

139185540 is a `hidden beast` number, since 1 + 39 + 1 + 85 + 540 = 666.

It is a super-2 number, since 2×139185540² = 38745229090183200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 139185495 and 139185504.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 62079 + ... + 64281.

Almost surely, 2^139185540 is an apocalyptic number.

139185540 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 139185540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235863264).

139185540 is an abundant number, since it is smaller than the sum of its proper divisors (332540988).

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

139185540 is a wasteful number, since it uses less digits than its factorization.

139185540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2240 (or 2226 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 139185540 is about 11797.6921471956. The cubic root of 139185540 is about 518.2405277222.

The spelling of 139185540 in words is "one hundred thirty-nine million, one hundred eighty-five thousand, five hundred forty".