2440087921 has 4 divisors (see below), whose sum is σ = 2456464500. Its totient is φ = 2423711344.

The previous prime is 2440087919. The next prime is 2440087943. The reversal of 2440087921 is 1297800442.

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 622003600 + 1818084321 = 24940^2 + 42639^2 .

It is a cyclic number.

It is not a de Polignac number, because 2440087921 - 2¹ = 2440087919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2440087961) 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, 8188066 + ... + 8188363.

It is an arithmetic number, because the mean of its divisors is an integer number (614116125).

Almost surely, 2^2440087921 is an apocalyptic number.

It is an amenable number.

2440087921 is a deficient number, since it is larger than the sum of its proper divisors (16376579).

2440087921 is a wasteful number, since it uses less digits than its factorization.

2440087921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16376578.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 2440087921 is about 49397.2460872061. The cubic root of 2440087921 is about 1346.2792693132.

The spelling of 2440087921 in words is "two billion, four hundred forty million, eighty-seven thousand, nine hundred twenty-one".