43381979 has 4 divisors (see below), whose sum is σ = 45268176. Its totient is φ = 41495784.

The previous prime is 43381967. The next prime is 43381993. The reversal of 43381979 is 97918334.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 43381979 - 2⁴ = 43381963 is a prime.

It is a super-2 number, since 2×43381979² = 3763992203912882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43381379) 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, 943064 + ... + 943109.

It is an arithmetic number, because the mean of its divisors is an integer number (11317044).

Almost surely, 2^43381979 is an apocalyptic number.

43381979 is a deficient number, since it is larger than the sum of its proper divisors (1886197).

43381979 is a wasteful number, since it uses less digits than its factorization.

43381979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1886196.

The product of its digits is 163296, while the sum is 44.

The square root of 43381979 is about 6586.4997532832. The cubic root of 43381979 is about 351.3741326604.

The spelling of 43381979 in words is "forty-three million, three hundred eighty-one thousand, nine hundred seventy-nine".