1902138543405 has 12 divisors (see below), whose sum is σ = 3297040141980. Its totient is φ = 1014473889792.

The previous prime is 1902138543359. The next prime is 1902138543413. The reversal of 1902138543405 is 5043458312091.

1902138543405 is a `hidden beast` number, since 1 + 90 + 2 + 13 + 8 + 543 + 4 + 0 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1280403139401 + 621735404004 = 1131549^2 + 788502^2 .

It is not a de Polignac number, because 1902138543405 - 2⁶ = 1902138543341 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 42269745409 = 1902138543405 / (1 + 9 + 0 + 2 + 1 + 3 + 8 + 5 + 4 + 3 + 4 + 0 + 5).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21134872660 + ... + 21134872749.

It is an arithmetic number, because the mean of its divisors is an integer number (274753345165).

Almost surely, 2^{1902138543405} is an apocalyptic number.

1902138543405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1902138543405 is a deficient number, since it is larger than the sum of its proper divisors (1394901598575).

1902138543405 is a wasteful number, since it uses less digits than its factorization.

1902138543405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42269745420 (or 42269745417 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 1902138543405 in words is "one trillion, nine hundred two billion, one hundred thirty-eight million, five hundred forty-three thousand, four hundred five".