40002131 has 6 divisors (see below), whose sum is σ = 43316100. Its totient is φ = 36924888.

The previous prime is 40002103. The next prime is 40002133. The reversal of 40002131 is 13120004.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-40002131 is a prime.

It is a super-2 number, since 2×40002131² = 3200340969082322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40002133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 118181 + ... + 118518.

It is an arithmetic number, because the mean of its divisors is an integer number (7219350).

Almost surely, 2^40002131 is an apocalyptic number.

40002131 is a deficient number, since it is larger than the sum of its proper divisors (3313969).

40002131 is a wasteful number, since it uses less digits than its factorization.

40002131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236725 (or 236712 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 40002131 is about 6324.7237884353. The cubic root of 40002131 is about 342.0012624921.

Adding to 40002131 its reverse (13120004), we get a palindrome (53122135).

The spelling of 40002131 in words is "forty million, two thousand, one hundred thirty-one".