1947431861405 has 16 divisors (see below), whose sum is σ = 2381334712704. Its totient is φ = 1528342495680.

The previous prime is 1947431861393. The next prime is 1947431861411. The reversal of 1947431861405 is 5041681347491.

It is not a de Polignac number, because 1947431861405 - 2⁸ = 1947431861149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1468112 + ... + 2459718.

It is an arithmetic number, because the mean of its divisors is an integer number (148833419544).

Almost surely, 2^{1947431861405} is an apocalyptic number.

It is an amenable number.

1947431861405 is a deficient number, since it is larger than the sum of its proper divisors (433902851299).

1947431861405 is an equidigital number, since it uses as much as digits as its factorization.

1947431861405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999076.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The spelling of 1947431861405 in words is "one trillion, nine hundred forty-seven billion, four hundred thirty-one million, eight hundred sixty-one thousand, four hundred five".