5405421 has 8 divisors (see below), whose sum is σ = 8236864. Its totient is φ = 3088800.

The previous prime is 5405381. The next prime is 5405447. The reversal of 5405421 is 1245045.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5405421 - 2⁶ = 5405357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 257401 = 5405421 / (5 + 4 + 0 + 5 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5405471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128680 + ... + 128721.

It is an arithmetic number, because the mean of its divisors is an integer number (1029608).

Almost surely, 2^5405421 is an apocalyptic number.

It is an amenable number.

5405421 is a deficient number, since it is larger than the sum of its proper divisors (2831443).

5405421 is a wasteful number, since it uses less digits than its factorization.

5405421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257411.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 5405421 is about 2324.9561286183. The cubic root of 5405421 is about 175.4997524367.

The spelling of 5405421 in words is "five million, four hundred five thousand, four hundred twenty-one".