139906747 has 4 divisors (see below), whose sum is σ = 147270280. Its totient is φ = 132543216.

The previous prime is 139906727. The next prime is 139906757. The reversal of 139906747 is 747609931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 139906747 - 2⁷ = 139906619 is a prime.

It is a super-2 number, since 2×139906747² = 39147795712244018, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139906697 and 139906706.

It is not an unprimeable number, because it can be changed into a prime (139906727) 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, 3681738 + ... + 3681775.

It is an arithmetic number, because the mean of its divisors is an integer number (36817570).

Almost surely, 2^139906747 is an apocalyptic number.

139906747 is a deficient number, since it is larger than the sum of its proper divisors (7363533).

139906747 is an equidigital number, since it uses as much as digits as its factorization.

139906747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7363532.

The product of its (nonzero) digits is 285768, while the sum is 46.

The square root of 139906747 is about 11828.2182512837. The cubic root of 139906747 is about 519.1340951367.

The spelling of 139906747 in words is "one hundred thirty-nine million, nine hundred six thousand, seven hundred forty-seven".