406645421 has 16 divisors (see below), whose sum is σ = 512698368. Its totient is φ = 313891200.

The previous prime is 406645409. The next prime is 406645433. The reversal of 406645421 is 124546604.

It is an interprime number because it is at equal distance from previous prime (406645409) and next prime (406645433).

It is not a de Polignac number, because 406645421 - 2⁶ = 406645357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406645021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50765 + ... + 58226.

It is an arithmetic number, because the mean of its divisors is an integer number (32043648).

Almost surely, 2^406645421 is an apocalyptic number.

406645421 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

406645421 is a deficient number, since it is larger than the sum of its proper divisors (106052947).

406645421 is a wasteful number, since it uses less digits than its factorization.

406645421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109052.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 406645421 is about 20165.4511727360. The cubic root of 406645421 is about 740.8642331622.

The spelling of 406645421 in words is "four hundred six million, six hundred forty-five thousand, four hundred twenty-one".