139444577 has 4 divisors (see below), whose sum is σ = 141011460. Its totient is φ = 137877696.

The previous prime is 139444573. The next prime is 139444589. The reversal of 139444577 is 775444931.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9461776 + 129982801 = 3076^2 + 11401^2 .

It is a cyclic number.

It is not a de Polignac number, because 139444577 - 2² = 139444573 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139444573) 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, 783308 + ... + 783485.

It is an arithmetic number, because the mean of its divisors is an integer number (35252865).

Almost surely, 2^139444577 is an apocalyptic number.

It is an amenable number.

139444577 is a deficient number, since it is larger than the sum of its proper divisors (1566883).

139444577 is an equidigital number, since it uses as much as digits as its factorization.

139444577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1566882.

The product of its digits is 423360, while the sum is 44.

The square root of 139444577 is about 11808.6653352528. The cubic root of 139444577 is about 518.5618261315.

The spelling of 139444577 in words is "one hundred thirty-nine million, four hundred forty-four thousand, five hundred seventy-seven".