421401040 has 40 divisors (see below), whose sum is σ = 986934600. Its totient is φ = 167325696.

The previous prime is 421401037. The next prime is 421401047. The reversal of 421401040 is 40104124.

It can be written as a sum of positive squares in 4 ways, for example, as 166464 + 421234576 = 408^2 + 20524^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421401047) 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, 8265 + ... + 30184.

It is an arithmetic number, because the mean of its divisors is an integer number (24673365).

Almost surely, 2^421401040 is an apocalyptic number.

421401040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421401040 is an abundant number, since it is smaller than the sum of its proper divisors (565533560).

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

421401040 is a wasteful number, since it uses less digits than its factorization.

421401040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38599 (or 38593 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 421401040 is about 20528.0549492639. The cubic root of 421401040 is about 749.7190295688.

Adding to 421401040 its reverse (40104124), we get a palindrome (461505164).

The spelling of 421401040 in words is "four hundred twenty-one million, four hundred one thousand, forty".