1947431861406 has 32 divisors (see below), whose sum is σ = 4467227212800. Its totient is φ = 628203825720.

The previous prime is 1947431861393. The next prime is 1947431861411. The reversal of 1947431861406 is 6041681347491.

It is a happy number.

1947431861406 is a `hidden beast` number, since 1 + 9 + 4 + 7 + 4 + 3 + 18 + 614 + 0 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 581668536 + ... + 581671883.

It is an arithmetic number, because the mean of its divisors is an integer number (139600850400).

Almost surely, 2^{1947431861406} is an apocalyptic number.

1947431861406 is an abundant number, since it is smaller than the sum of its proper divisors (2519795351394).

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

1947431861406 is a wasteful number, since it uses less digits than its factorization.

1947431861406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163340461 (or 1163340455 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The spelling of 1947431861406 in words is "one trillion, nine hundred forty-seven billion, four hundred thirty-one million, eight hundred sixty-one thousand, four hundred six".