139426261 has 4 divisors (see below), whose sum is σ = 150151372. Its totient is φ = 128701152.

The previous prime is 139426219. The next prime is 139426267. The reversal of 139426261 is 162624931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162624931 = 7 ⋅23232133.

It can be written as a sum of positive squares in 2 ways, for example, as 38825361 + 100600900 = 6231^2 + 10030^2 .

It is a cyclic number.

It is not a de Polignac number, because 139426261 - 2²³ = 131037653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139426267) 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, 5362536 + ... + 5362561.

It is an arithmetic number, because the mean of its divisors is an integer number (37537843).

Almost surely, 2^139426261 is an apocalyptic number.

It is an amenable number.

139426261 is a deficient number, since it is larger than the sum of its proper divisors (10725111).

139426261 is a wasteful number, since it uses less digits than its factorization.

139426261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10725110.

The product of its digits is 15552, while the sum is 34.

The square root of 139426261 is about 11807.8897776021. The cubic root of 139426261 is about 518.5391208281.

The spelling of 139426261 in words is "one hundred thirty-nine million, four hundred twenty-six thousand, two hundred sixty-one".