139924540 has 48 divisors (see below), whose sum is σ = 336655872. Its totient is φ = 47854656.

The previous prime is 139924517. The next prime is 139924541. The reversal of 139924540 is 45429931.

It is a self number, because there is not a number n which added to its sum of digits gives 139924540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139924541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69427 + ... + 71413.

It is an arithmetic number, because the mean of its divisors is an integer number (7013664).

Almost surely, 2^139924540 is an apocalyptic number.

139924540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139924540 is an abundant number, since it is smaller than the sum of its proper divisors (196731332).

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

139924540 is a wasteful number, since it uses less digits than its factorization.

139924540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2506 (or 2504 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 139924540 is about 11828.9703693939. The cubic root of 139924540 is about 519.1561016080.

The spelling of 139924540 in words is "one hundred thirty-nine million, nine hundred twenty-four thousand, five hundred forty".