1555138 has 24 divisors (see below), whose sum is σ = 2608848. Its totient is φ = 694512.

The previous prime is 1555133. The next prime is 1555153. The reversal of 1555138 is 8315551.

It is not an unprimeable number, because it can be changed into a prime (1555133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14481 + ... + 14587.

It is an arithmetic number, because the mean of its divisors is an integer number (108702).

2^1555138 is an apocalyptic number.

1555138 is a deficient number, since it is larger than the sum of its proper divisors (1053710).

1555138 is a wasteful number, since it uses less digits than its factorization.

1555138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 165 counting only the distinct ones).

The product of its digits is 3000, while the sum is 28.

The square root of 1555138 is about 1247.0517230652. The cubic root of 1555138 is about 115.8571865144.

The spelling of 1555138 in words is "one million, five hundred fifty-five thousand, one hundred thirty-eight".