40579621 has 4 divisors (see below), whose sum is σ = 40718412. Its totient is φ = 40440832.

The previous prime is 40579619. The next prime is 40579711. The reversal of 40579621 is 12697504.

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 18395521 + 22184100 = 4289^2 + 4710^2 .

It is a cyclic number.

It is not a de Polignac number, because 40579621 - 2¹ = 40579619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40579321) 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, 68956 + ... + 69541.

It is an arithmetic number, because the mean of its divisors is an integer number (10179603).

Almost surely, 2^40579621 is an apocalyptic number.

It is an amenable number.

40579621 is a deficient number, since it is larger than the sum of its proper divisors (138791).

40579621 is a wasteful number, since it uses less digits than its factorization.

40579621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138790.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 40579621 is about 6370.2135756974. The cubic root of 40579621 is about 343.6391706181.

The spelling of 40579621 in words is "forty million, five hundred seventy-nine thousand, six hundred twenty-one".