420403406 has 16 divisors (see below), whose sum is σ = 639172944. Its totient is φ = 207365184.

The previous prime is 420403393. The next prime is 420403409. The reversal of 420403406 is 604304024.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420403409) 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, 39956 + ... + 49368.

It is an arithmetic number, because the mean of its divisors is an integer number (39948309).

Almost surely, 2^420403406 is an apocalyptic number.

420403406 is a deficient number, since it is larger than the sum of its proper divisors (218769538).

420403406 is a wasteful number, since it uses less digits than its factorization.

420403406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9715.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 420403406 is about 20503.7412683637. The cubic root of 420403406 is about 749.1269283519.

The spelling of 420403406 in words is "four hundred twenty million, four hundred three thousand, four hundred six".