40442621 has 4 divisors (see below), whose sum is σ = 42571200. Its totient is φ = 38314044.

The previous prime is 40442603. The next prime is 40442627. The reversal of 40442621 is 12624404.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40442621 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 (40442627) 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, 1064261 + ... + 1064298.

It is an arithmetic number, because the mean of its divisors is an integer number (10642800).

Almost surely, 2^40442621 is an apocalyptic number.

It is an amenable number.

40442621 is a deficient number, since it is larger than the sum of its proper divisors (2128579).

40442621 is a wasteful number, since it uses less digits than its factorization.

40442621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2128578.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 40442621 is about 6359.4513128099. The cubic root of 40442621 is about 343.2520169589.

The spelling of 40442621 in words is "forty million, four hundred forty-two thousand, six hundred twenty-one".