43742819 has 4 divisors (see below), whose sum is σ = 46315944. Its totient is φ = 41169696.

The previous prime is 43742801. The next prime is 43742833. The reversal of 43742819 is 91824734.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91824734 = 2 ⋅45912367.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43742819 is a prime.

It is a super-2 number, since 2×43742819² = 3826868428133522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43742879) 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, 1286537 + ... + 1286570.

It is an arithmetic number, because the mean of its divisors is an integer number (11578986).

Almost surely, 2^43742819 is an apocalyptic number.

43742819 is a deficient number, since it is larger than the sum of its proper divisors (2573125).

43742819 is a wasteful number, since it uses less digits than its factorization.

43742819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2573124.

The product of its digits is 48384, while the sum is 38.

The square root of 43742819 is about 6613.8354228088. The cubic root of 43742819 is about 352.3456568237.

It can be divided in two parts, 437 and 42819, that multiplied together give a triangular number (18711903 = T₆₁₁₇).

The spelling of 43742819 in words is "forty-three million, seven hundred forty-two thousand, eight hundred nineteen".