40002120 has 64 divisors (see below), whose sum is σ = 133344000. Its totient is φ = 10666944.

The previous prime is 40002103. The next prime is 40002133. The reversal of 40002120 is 2120004.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17440 + ... + 19599.

It is an arithmetic number, because the mean of its divisors is an integer number (2083500).

Almost surely, 2^40002120 is an apocalyptic number.

40002120 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40002120 is an abundant number, since it is smaller than the sum of its proper divisors (93341880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40002120 is a wasteful number, since it uses less digits than its factorization.

40002120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37059 (or 37049 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 40002120 is about 6324.7229188321. The cubic root of 40002120 is about 342.0012311436.

Adding to 40002120 its reverse (2120004), we get a palindrome (42122124).

The spelling of 40002120 in words is "forty million, two thousand, one hundred twenty".