139542820 has 12 divisors (see below), whose sum is σ = 293039964. Its totient is φ = 55817120.

The previous prime is 139542797. The next prime is 139542827. The reversal of 139542820 is 28245931.

It can be written as a sum of positive squares in 2 ways, for example, as 19289664 + 120253156 = 4392^2 + 10966^2 .

It is a super-2 number, since 2×139542820² = 38944397227104800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139542827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3488551 + ... + 3488590.

It is an arithmetic number, because the mean of its divisors is an integer number (24419997).

Almost surely, 2^139542820 is an apocalyptic number.

139542820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139542820 is an abundant number, since it is smaller than the sum of its proper divisors (153497144).

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

139542820 is a wasteful number, since it uses less digits than its factorization.

139542820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6977150 (or 6977148 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 139542820 is about 11812.8243870803. The cubic root of 139542820 is about 518.6835784701.

The spelling of 139542820 in words is "one hundred thirty-nine million, five hundred forty-two thousand, eight hundred twenty".