43897399213 has 4 divisors (see below), whose sum is σ = 43956481248. Its totient is φ = 43838317180.

The previous prime is 43897399181. The next prime is 43897399229. The reversal of 43897399213 is 31299379834.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43897399213 - 2⁵ = 43897399181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43897399253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29539903 + ... + 29541388.

It is an arithmetic number, because the mean of its divisors is an integer number (10989120312).

Almost surely, 2^43897399213 is an apocalyptic number.

It is an amenable number.

43897399213 is a deficient number, since it is larger than the sum of its proper divisors (59082035).

43897399213 is an equidigital number, since it uses as much as digits as its factorization.

43897399213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59082034.

The product of its digits is 8817984, while the sum is 58.

The spelling of 43897399213 in words is "forty-three billion, eight hundred ninety-seven million, three hundred ninety-nine thousand, two hundred thirteen".