400721832 has 48 divisors (see below), whose sum is σ = 1240331040. Its totient is φ = 114491808.

The previous prime is 400721831. The next prime is 400721869. The reversal of 400721832 is 238127004.

It is a junction number, because it is equal to n+sod(n) for n = 400721796 and 400721805.

It is not an unprimeable number, because it can be changed into a prime (400721831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 397038 + ... + 398045.

It is an arithmetic number, because the mean of its divisors is an integer number (25840230).

Almost surely, 2^400721832 is an apocalyptic number.

400721832 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is an amenable number.

400721832 is an abundant number, since it is smaller than the sum of its proper divisors (839609208).

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

400721832 is a wasteful number, since it uses less digits than its factorization.

400721832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795102 (or 795095 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 400721832 is about 20018.0376660651. The cubic root of 400721832 is about 737.2492420307.

Adding to 400721832 its reverse (238127004), we get a palindrome (638848836).

The spelling of 400721832 in words is "four hundred million, seven hundred twenty-one thousand, eight hundred thirty-two".