421900831 has 4 divisors (see below), whose sum is σ = 460255464. Its totient is φ = 383546200.

The previous prime is 421900823. The next prime is 421900847. The reversal of 421900831 is 138009124.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421900831 - 2³ = 421900823 is a prime.

It is a super-2 number, since 2×421900831² = 356000622396981122, which contains 22 as substring.

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 421900831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421900931) 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, 19177300 + ... + 19177321.

It is an arithmetic number, because the mean of its divisors is an integer number (115063866).

Almost surely, 2^421900831 is an apocalyptic number.

421900831 is a deficient number, since it is larger than the sum of its proper divisors (38354633).

421900831 is a wasteful number, since it uses less digits than its factorization.

421900831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38354632.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 421900831 is about 20540.2247066579. The cubic root of 421900831 is about 750.0153069469.

Adding to 421900831 its reverse (138009124), we get a palindrome (559909955).

The spelling of 421900831 in words is "four hundred twenty-one million, nine hundred thousand, eight hundred thirty-one".