400421532 has 36 divisors (see below), whose sum is σ = 1086860040. Its totient is φ = 114405984.

The previous prime is 400421509. The next prime is 400421551. The reversal of 400421532 is 235124004.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 400421499 and 400421508.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 339907 + ... + 341082.

Almost surely, 2^400421532 is an apocalyptic number.

400421532 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is an amenable number.

400421532 is an abundant number, since it is smaller than the sum of its proper divisors (686438508).

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

400421532 is a wasteful number, since it uses less digits than its factorization.

400421532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681010 (or 681001 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 400421532 is about 20010.5355250678. The cubic root of 400421532 is about 737.0650317238.

Adding to 400421532 its reverse (235124004), we get a palindrome (635545536).

The spelling of 400421532 in words is "four hundred million, four hundred twenty-one thousand, five hundred thirty-two".