155642244 has 12 divisors (see below), whose sum is σ = 363165264. Its totient is φ = 51880744.

The previous prime is 155642233. The next prime is 155642287. The reversal of 155642244 is 442246551.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6485082 + ... + 6485105.

It is an arithmetic number, because the mean of its divisors is an integer number (30263772).

Almost surely, 2^155642244 is an apocalyptic number.

It is an amenable number.

155642244 is an abundant number, since it is smaller than the sum of its proper divisors (207523020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155642244 is a wasteful number, since it uses less digits than its factorization.

155642244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12970194 (or 12970192 counting only the distinct ones).

The product of its digits is 38400, while the sum is 33.

The square root of 155642244 is about 12475.6660744026. Note that the first 3 decimals coincide. The cubic root of 155642244 is about 537.9094341363.

Adding to 155642244 its reverse (442246551), we get a palindrome (597888795).

The spelling of 155642244 in words is "one hundred fifty-five million, six hundred forty-two thousand, two hundred forty-four".