40040621 has 4 divisors (see below), whose sum is σ = 40309500. Its totient is φ = 39771744.

The previous prime is 40040603. The next prime is 40040629. The reversal of 40040621 is 12604004.

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 1464100 + 38576521 = 1210^2 + 6211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40040621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40040621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40040629) 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, 134216 + ... + 134513.

It is an arithmetic number, because the mean of its divisors is an integer number (10077375).

Almost surely, 2^40040621 is an apocalyptic number.

It is an amenable number.

40040621 is a deficient number, since it is larger than the sum of its proper divisors (268879).

40040621 is a wasteful number, since it uses less digits than its factorization.

40040621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268878.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 40040621 is about 6327.7658774642. The cubic root of 40040621 is about 342.1109183905.

Adding to 40040621 its reverse (12604004), we get a palindrome (52644625).

The spelling of 40040621 in words is "forty million, forty thousand, six hundred twenty-one".