421261788 has 24 divisors (see below), whose sum is σ = 984928000. Its totient is φ = 140137200.

The previous prime is 421261781. The next prime is 421261811. The reversal of 421261788 is 887162124.

It is a happy number.

It is a super-2 number, since 2×421261788² = 354922988057913888, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421261781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29188 + ... + 41163.

Almost surely, 2^421261788 is an apocalyptic number.

It is an amenable number.

421261788 is an abundant number, since it is smaller than the sum of its proper divisors (563666212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421261788 is a wasteful number, since it uses less digits than its factorization.

421261788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70857 (or 70855 counting only the distinct ones).

The product of its digits is 43008, while the sum is 39.

The square root of 421261788 is about 20524.6629204964. The cubic root of 421261788 is about 749.6364389040.

The spelling of 421261788 in words is "four hundred twenty-one million, two hundred sixty-one thousand, seven hundred eighty-eight".