155804639 has 4 divisors (see below), whose sum is σ = 155831256. Its totient is φ = 155778024.

The previous prime is 155804629. The next prime is 155804653. The reversal of 155804639 is 936408551.

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 155804639 - 2¹² = 155800543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155804596 and 155804605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155804629) 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, 269 + ... + 17654.

It is an arithmetic number, because the mean of its divisors is an integer number (38957814).

Almost surely, 2^155804639 is an apocalyptic number.

155804639 is a deficient number, since it is larger than the sum of its proper divisors (26617).

155804639 is an equidigital number, since it uses as much as digits as its factorization.

155804639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26616.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 155804639 is about 12482.1728477056. The cubic root of 155804639 is about 538.0964515695.

The spelling of 155804639 in words is "one hundred fifty-five million, eight hundred four thousand, six hundred thirty-nine".