43947687399 has 64 divisors (see below), whose sum is σ = 73538150400. Its totient is φ = 22679809920.

The previous prime is 43947687383. The next prime is 43947687409. The reversal of 43947687399 is 99378674934.

It is not a de Polignac number, because 43947687399 - 2⁴ = 43947687383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43947687799) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28370877 + ... + 28372425.

It is an arithmetic number, because the mean of its divisors is an integer number (1149033600).

Almost surely, 2^43947687399 is an apocalyptic number.

43947687399 is a deficient number, since it is larger than the sum of its proper divisors (29590463001).

43947687399 is a wasteful number, since it uses less digits than its factorization.

43947687399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2300.

The product of its digits is 246903552, while the sum is 69.

The spelling of 43947687399 in words is "forty-three billion, nine hundred forty-seven million, six hundred eighty-seven thousand, three hundred ninety-nine".