400820535 has 16 divisors (see below), whose sum is σ = 712570080. Its totient is φ = 213770880.

The previous prime is 400820527. The next prime is 400820549. The reversal of 400820535 is 535028004.

It is not a de Polignac number, because 400820535 - 2³ = 400820527 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 400820499 and 400820508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1484386 + ... + 1484655.

It is an arithmetic number, because the mean of its divisors is an integer number (44535630).

Almost surely, 2^400820535 is an apocalyptic number.

400820535 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

400820535 is a deficient number, since it is larger than the sum of its proper divisors (311749545).

400820535 is a wasteful number, since it uses less digits than its factorization.

400820535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2969055 (or 2969049 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 400820535 is about 20020.5028658123. The cubic root of 400820535 is about 737.3097684211.

Adding to 400820535 its reverse (535028004), we get a palindrome (935848539).

The spelling of 400820535 in words is "four hundred million, eight hundred twenty thousand, five hundred thirty-five".