400206344 has 16 divisors (see below), whose sum is σ = 754277820. Its totient is φ = 199065600.

The previous prime is 400206341. The next prime is 400206347. The reversal of 400206344 is 443602004.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (400206341) and next prime (400206347).

It can be written as a sum of positive squares in 2 ways, for example, as 378769444 + 21436900 = 19462^2 + 4630^2 .

It is not an unprimeable number, because it can be changed into a prime (400206341) 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, 128057 + ... + 131144.

Almost surely, 2^400206344 is an apocalyptic number.

It is an amenable number.

400206344 is a deficient number, since it is larger than the sum of its proper divisors (354071476).

400206344 is a wasteful number, since it uses less digits than its factorization.

400206344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259400 (or 259396 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 400206344 is about 20005.1579348927. The cubic root of 400206344 is about 736.9329742477.

Adding to 400206344 its reverse (443602004), we get a palindrome (843808348).

It can be divided in two parts, 40020 and 6344, that added together give a palindrome (46364).

The spelling of 400206344 in words is "four hundred million, two hundred six thousand, three hundred forty-four".