1355139405 has 24 divisors (see below), whose sum is σ = 2429907480. Its totient is φ = 697818240.

The previous prime is 1355139361. The next prime is 1355139407. The reversal of 1355139405 is 5049315531.

It is a happy number.

1355139405 is a `hidden beast` number, since 13 + 551 + 3 + 94 + 0 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2812329 + 1352327076 = 1677^2 + 36774^2 .

It is not a de Polignac number, because 1355139405 - 2⁶ = 1355139341 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1355139405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355139407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 517906 + ... + 520515.

It is an arithmetic number, because the mean of its divisors is an integer number (101246145).

Almost surely, 2^1355139405 is an apocalyptic number.

1355139405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1355139405 is a deficient number, since it is larger than the sum of its proper divisors (1074768075).

1355139405 is a wasteful number, since it uses less digits than its factorization.

1355139405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038461 (or 1038458 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 36.

The square root of 1355139405 is about 36812.2181483268. The cubic root of 1355139405 is about 1106.6101721031.

The spelling of 1355139405 in words is "one billion, three hundred fifty-five million, one hundred thirty-nine thousand, four hundred five".