139426281 has 24 divisors (see below), whose sum is σ = 207062856. Its totient is φ = 90351360.

The previous prime is 139426279. The next prime is 139426283. The reversal of 139426281 is 182624931.

139426281 is a `hidden beast` number, since 1 + 394 + 262 + 8 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (139426279) and next prime (139426283).

It can be written as a sum of positive squares in 4 ways, for example, as 7750656 + 131675625 = 2784^2 + 11475^2 .

It is not a de Polignac number, because 139426281 - 2¹ = 139426279 is a prime.

It is a super-2 number, since 2×139426281² = 38879375666981922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139426283) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 137131 + ... + 138143.

It is an arithmetic number, because the mean of its divisors is an integer number (8627619).

Almost surely, 2^139426281 is an apocalyptic number.

It is an amenable number.

139426281 is a deficient number, since it is larger than the sum of its proper divisors (67636575).

139426281 is a wasteful number, since it uses less digits than its factorization.

139426281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433 (or 1430 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 139426281 is about 11807.8906244934. The cubic root of 139426281 is about 518.5391456220.

The spelling of 139426281 in words is "one hundred thirty-nine million, four hundred twenty-six thousand, two hundred eighty-one".