400535801 has 4 divisors (see below), whose sum is σ = 404501604. Its totient is φ = 396570000.

The previous prime is 400535797. The next prime is 400535809. The reversal of 400535801 is 108535004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 216119401 + 184416400 = 14701^2 + 13580^2 .

It is a cyclic number.

It is not a de Polignac number, because 400535801 - 2² = 400535797 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400535809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1982750 + ... + 1982951.

It is an arithmetic number, because the mean of its divisors is an integer number (101125401).

Almost surely, 2^400535801 is an apocalyptic number.

It is an amenable number.

400535801 is a deficient number, since it is larger than the sum of its proper divisors (3965803).

400535801 is a wasteful number, since it uses less digits than its factorization.

400535801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3965802.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 400535801 is about 20013.3905423344. The cubic root of 400535801 is about 737.1351375722.

It can be divided in two parts, 40053 and 5801, that added together give a palindrome (45854).

The spelling of 400535801 in words is "four hundred million, five hundred thirty-five thousand, eight hundred one".