43897690 has 8 divisors (see below), whose sum is σ = 79015860. Its totient is φ = 17559072.

The previous prime is 43897661. The next prime is 43897691. The reversal of 43897690 is 9679834.

It can be written as a sum of positive squares in 2 ways, for example, as 35271721 + 8625969 = 5939^2 + 2937^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×43897690² = 3854014374672200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 43897690.

It is not an unprimeable number, because it can be changed into a prime (43897691) 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, 2194875 + ... + 2194894.

Almost surely, 2^43897690 is an apocalyptic number.

43897690 is a deficient number, since it is larger than the sum of its proper divisors (35118170).

43897690 is a wasteful number, since it uses less digits than its factorization.

43897690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4389776.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 43897690 is about 6625.5331860915. The cubic root of 43897690 is about 352.7609924342.

The spelling of 43897690 in words is "forty-three million, eight hundred ninety-seven thousand, six hundred ninety".