420158421 has 42 divisors (see below), whose sum is σ = 648973122. Its totient is φ = 271887840.

The previous prime is 420158413. The next prime is 420158429. The reversal of 420158421 is 124851024.

It is an interprime number because it is at equal distance from previous prime (420158413) and next prime (420158429).

It can be written as a sum of positive squares in 3 ways, for example, as 92910321 + 327248100 = 9639^2 + 18090^2 .

It is not a de Polignac number, because 420158421 - 2³ = 420158413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420158429) by changing a digit.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 997791 + ... + 998211.

It is an arithmetic number, because the mean of its divisors is an integer number (15451741).

Almost surely, 2^420158421 is an apocalyptic number.

It is an amenable number.

420158421 is a deficient number, since it is larger than the sum of its proper divisors (228814701).

420158421 is an frugal number, since it uses more digits than its factorization.

420158421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513 (or 461 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 420158421 is about 20497.7662441545. The cubic root of 420158421 is about 748.9813851915.

The spelling of 420158421 in words is "four hundred twenty million, one hundred fifty-eight thousand, four hundred twenty-one".