43542369 has 48 divisors (see below), whose sum is σ = 72006480. Its totient is φ = 25159680.

The previous prime is 43542337. The next prime is 43542409. The reversal of 43542369 is 96324534.

It can be written as a sum of positive squares in 8 ways, for example, as 23184225 + 20358144 = 4815^2 + 4512^2 .

It is not a de Polignac number, because 43542369 - 2⁵ = 43542337 is a prime.

It is a super-2 number, since 2×43542369² = 3791875796264322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (43542869) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 138957 + ... + 139269.

It is an arithmetic number, because the mean of its divisors is an integer number (1500135).

Almost surely, 2^43542369 is an apocalyptic number.

It is an amenable number.

43542369 is a deficient number, since it is larger than the sum of its proper divisors (28464111).

43542369 is a wasteful number, since it uses less digits than its factorization.

43542369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 399 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 43542369 is about 6598.6641829995. The cubic root of 43542369 is about 351.8066285747.

The spelling of 43542369 in words is "forty-three million, five hundred forty-two thousand, three hundred sixty-nine".