1947944390397 has 16 divisors (see below), whose sum is σ = 2750085276480. Its totient is φ = 1222219112192.

The previous prime is 1947944390383. The next prime is 1947944390459. The reversal of 1947944390397 is 7930934497491.

It is a cyclic number.

It is not a de Polignac number, because 1947944390397 - 2²⁶ = 1947877281533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1947944390897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3104818 + ... + 3679100.

It is an arithmetic number, because the mean of its divisors is an integer number (171880329780).

Almost surely, 2^{1947944390397} is an apocalyptic number.

1947944390397 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1947944390397 is a deficient number, since it is larger than the sum of its proper divisors (802140886083).

1947944390397 is a wasteful number, since it uses less digits than its factorization.

1947944390397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640812.

The product of its (nonzero) digits is 185177664, while the sum is 69.

The spelling of 1947944390397 in words is "one trillion, nine hundred forty-seven billion, nine hundred forty-four million, three hundred ninety thousand, three hundred ninety-seven".