45840421 has 4 divisors (see below), whose sum is σ = 50007744. Its totient is φ = 41673100.

The previous prime is 45840409. The next prime is 45840433. The reversal of 45840421 is 12404854.

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 an interprime number because it is at equal distance from previous prime (45840409) and next prime (45840433).

It is a cyclic number.

It is not a de Polignac number, because 45840421 - 2⁹ = 45839909 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 45840421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45840401) 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, 2083645 + ... + 2083666.

It is an arithmetic number, because the mean of its divisors is an integer number (12501936).

Almost surely, 2^45840421 is an apocalyptic number.

It is an amenable number.

45840421 is a deficient number, since it is larger than the sum of its proper divisors (4167323).

45840421 is a wasteful number, since it uses less digits than its factorization.

45840421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4167322.

The product of its (nonzero) digits is 5120, while the sum is 28.

The square root of 45840421 is about 6770.5554425025. Note that the first 3 decimals coincide. The cubic root of 45840421 is about 357.8899743034.

The spelling of 45840421 in words is "forty-five million, eight hundred forty thousand, four hundred twenty-one".