139077842 has 18 divisors (see below), whose sum is σ = 216367749. Its totient is φ = 67045560.

The previous prime is 139077839. The next prime is 139077847. The reversal of 139077842 is 248770931.

It can be written as a sum of positive squares in 2 ways, for example, as 104019601 + 35058241 = 10199^2 + 5921^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=8339.

It is a super-2 number, since 2×139077842² = 38685292270753928, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139077842.

It is not an unprimeable number, because it can be changed into a prime (139077847) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 516884 + ... + 517152.

Almost surely, 2^139077842 is an apocalyptic number.

139077842 is a deficient number, since it is larger than the sum of its proper divisors (77289907).

139077842 is an frugal number, since it uses more digits than its factorization.

139077842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602 (or 302 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 139077842 is about 11793.1268966292. The cubic root of 139077842 is about 518.1068264048.

The spelling of 139077842 in words is "one hundred thirty-nine million, seventy-seven thousand, eight hundred forty-two".