421400144 has 20 divisors (see below), whose sum is σ = 890687040. Its totient is φ = 191545440.

The previous prime is 421400113. The next prime is 421400149. The reversal of 421400144 is 441004124.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421400149) 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, 1196984 + ... + 1197335.

It is an arithmetic number, because the mean of its divisors is an integer number (44534352).

Almost surely, 2^421400144 is an apocalyptic number.

421400144 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

421400144 is an abundant number, since it is smaller than the sum of its proper divisors (469286896).

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

421400144 is a wasteful number, since it uses less digits than its factorization.

421400144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2394338 (or 2394332 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 421400144 is about 20528.0331254604. The cubic root of 421400144 is about 749.7184982074.

Adding to 421400144 its reverse (441004124), we get a palindrome (862404268).

The spelling of 421400144 in words is "four hundred twenty-one million, four hundred thousand, one hundred forty-four".