43402131 has 24 divisors (see below), whose sum is σ = 64157184. Its totient is φ = 28266480.

The previous prime is 43402109. The next prime is 43402133. The reversal of 43402131 is 13120434.

It is not a de Polignac number, because 43402131 - 2²¹ = 41304979 is a prime.

It is a super-2 number, since 2×43402131² = 3767489950682322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (43402133) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100486 + ... + 100916.

It is an arithmetic number, because the mean of its divisors is an integer number (2673216).

Almost surely, 2^43402131 is an apocalyptic number.

43402131 is a deficient number, since it is larger than the sum of its proper divisors (20755053).

43402131 is a wasteful number, since it uses less digits than its factorization.

43402131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671 (or 668 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 43402131 is about 6588.0293715192. The cubic root of 43402131 is about 351.4285315572.

Adding to 43402131 its reverse (13120434), we get a palindrome (56522565).

The spelling of 43402131 in words is "forty-three million, four hundred two thousand, one hundred thirty-one".