40021310 has 32 divisors (see below), whose sum is σ = 84989952. Its totient is φ = 13278240.

The previous prime is 40021273. The next prime is 40021313. The reversal of 40021310 is 1312004.

It is a happy number.

It is a super-2 number, since 2×40021310² = 3203410508232200, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40021291 and 40021300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40021313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7052 + ... + 11391.

It is an arithmetic number, because the mean of its divisors is an integer number (2655936).

Almost surely, 2^40021310 is an apocalyptic number.

40021310 is an abundant number, since it is smaller than the sum of its proper divisors (44968642).

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

40021310 is a wasteful number, since it uses less digits than its factorization.

40021310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18488.

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

The square root of 40021310 is about 6326.2397994385. The cubic root of 40021310 is about 342.0559111991.

Adding to 40021310 its reverse (1312004), we get a palindrome (41333314).

The spelling of 40021310 in words is "forty million, twenty-one thousand, three hundred ten".