55139629 has 4 divisors (see below), whose sum is σ = 56484540. Its totient is φ = 53794720.

The previous prime is 55139611. The next prime is 55139641. The reversal of 55139629 is 92693155.

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 22306729 + 32832900 = 4723^2 + 5730^2 .

It is a cyclic number.

It is not a de Polignac number, because 55139629 - 2⁵ = 55139597 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55139591 and 55139600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55133629) 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, 672394 + ... + 672475.

It is an arithmetic number, because the mean of its divisors is an integer number (14121135).

Almost surely, 2^55139629 is an apocalyptic number.

It is an amenable number.

55139629 is a deficient number, since it is larger than the sum of its proper divisors (1344911).

55139629 is a wasteful number, since it uses less digits than its factorization.

55139629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344910.

The product of its digits is 72900, while the sum is 40.

The square root of 55139629 is about 7425.6063052117. The cubic root of 55139629 is about 380.6167937902.

The spelling of 55139629 in words is "fifty-five million, one hundred thirty-nine thousand, six hundred twenty-nine".