40513421 has 4 divisors (see below), whose sum is σ = 43629852. Its totient is φ = 37396992.

The previous prime is 40513393. The next prime is 40513427. The reversal of 40513421 is 12431504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6056521 + 34456900 = 2461^2 + 5870^2 .

It is a cyclic number.

It is not a de Polignac number, because 40513421 - 2¹⁰ = 40512397 is a prime.

It is a super-2 number, since 2×40513421² = 3282674562246482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40513393 and 40513402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40513427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1558196 + ... + 1558221.

It is an arithmetic number, because the mean of its divisors is an integer number (10907463).

Almost surely, 2^40513421 is an apocalyptic number.

It is an amenable number.

40513421 is a deficient number, since it is larger than the sum of its proper divisors (3116431).

40513421 is a wasteful number, since it uses less digits than its factorization.

40513421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3116430.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 40513421 is about 6365.0153966821. The cubic root of 40513421 is about 343.4522024280.

Adding to 40513421 its reverse (12431504), we get a palindrome (52944925).

The spelling of 40513421 in words is "forty million, five hundred thirteen thousand, four hundred twenty-one".