1555438136 has 32 divisors (see below), whose sum is σ = 3334471680. Its totient is φ = 666338400.

The previous prime is 1555438133. The next prime is 1555438139. The reversal of 1555438136 is 6318345551.

It is an interprime number because it is at equal distance from previous prime (1555438133) and next prime (1555438139).

It is a junction number, because it is equal to n+sod(n) for n = 1555438093 and 1555438102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555438133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185801 + ... + 193991.

It is an arithmetic number, because the mean of its divisors is an integer number (104202240).

Almost surely, 2^1555438136 is an apocalyptic number.

It is an amenable number.

1555438136 is an abundant number, since it is smaller than the sum of its proper divisors (1779033544).

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

1555438136 is a wasteful number, since it uses less digits than its factorization.

1555438136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11595 (or 11591 counting only the distinct ones).

The product of its digits is 216000, while the sum is 41.

The square root of 1555438136 is about 39439.0432946845. The cubic root of 1555438136 is about 1158.6463937402.

The spelling of 1555438136 in words is "one billion, five hundred fifty-five million, four hundred thirty-eight thousand, one hundred thirty-six".