139452287 has 4 divisors (see below), whose sum is σ = 150179400. Its totient is φ = 128725176.

The previous prime is 139452281. The next prime is 139452319. The reversal of 139452287 is 782254931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 782254931 = 53 ⋅14759527.

It is a cyclic number.

It is not a de Polignac number, because 139452287 - 2¹² = 139448191 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 (139452281) 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, 5363537 + ... + 5363562.

It is an arithmetic number, because the mean of its divisors is an integer number (37544850).

Almost surely, 2^139452287 is an apocalyptic number.

139452287 is a deficient number, since it is larger than the sum of its proper divisors (10727113).

139452287 is a wasteful number, since it uses less digits than its factorization.

139452287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10727112.

The product of its digits is 120960, while the sum is 41.

The square root of 139452287 is about 11808.9917859231. The cubic root of 139452287 is about 518.5713831854.

The spelling of 139452287 in words is "one hundred thirty-nine million, four hundred fifty-two thousand, two hundred eighty-seven".