1355635638 has 24 divisors (see below), whose sum is σ = 3356812368. Its totient is φ = 387324432.

The previous prime is 1355635613. The next prime is 1355635639. The reversal of 1355635638 is 8365365531.

It is a happy number.

1355635638 is a `hidden beast` number, since 1 + 3 + 5 + 5 + 6 + 3 + 5 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1355635593 and 1355635602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355635639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5379381 + ... + 5379632.

It is an arithmetic number, because the mean of its divisors is an integer number (139867182).

Almost surely, 2^1355635638 is an apocalyptic number.

1355635638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1355635638 is an abundant number, since it is smaller than the sum of its proper divisors (2001176730).

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

1355635638 is a wasteful number, since it uses less digits than its factorization.

1355635638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10759028 (or 10759025 counting only the distinct ones).

The product of its digits is 972000, while the sum is 45.

The square root of 1355635638 is about 36818.9575898069. The cubic root of 1355635638 is about 1106.7452306485.

It can be divided in two parts, 13556 and 35638, that added together give a palindrome (49194).

The spelling of 1355635638 in words is "one billion, three hundred fifty-five million, six hundred thirty-five thousand, six hundred thirty-eight".