400421450 has 48 divisors (see below), whose sum is σ = 875006496. Its totient is φ = 134404800.

The previous prime is 400421449. The next prime is 400421479. The reversal of 400421450 is 54124004.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20852 + ... + 35151.

It is an arithmetic number, because the mean of its divisors is an integer number (18229302).

Almost surely, 2^400421450 is an apocalyptic number.

400421450 is an abundant number, since it is smaller than the sum of its proper divisors (474585046).

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

400421450 is a wasteful number, since it uses less digits than its factorization.

400421450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56039 (or 56034 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 400421450 is about 20010.5334761470. The cubic root of 400421450 is about 737.0649814107.

Adding to 400421450 its reverse (54124004), we get a palindrome (454545454).

The spelling of 400421450 in words is "four hundred million, four hundred twenty-one thousand, four hundred fifty".