400247245 has 4 divisors (see below), whose sum is σ = 480296700. Its totient is φ = 320197792.

The previous prime is 400247191. The next prime is 400247249. The reversal of 400247245 is 542742004.

It is a happy number.

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 155825289 + 244421956 = 12483^2 + 15634^2 .

It is a cyclic number.

It is not a de Polignac number, because 400247245 - 2¹³ = 400239053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400247249) 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, 40024720 + ... + 40024729.

It is an arithmetic number, because the mean of its divisors is an integer number (120074175).

Almost surely, 2^400247245 is an apocalyptic number.

It is an amenable number.

400247245 is a deficient number, since it is larger than the sum of its proper divisors (80049455).

400247245 is an equidigital number, since it uses as much as digits as its factorization.

400247245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80049454.

The product of its (nonzero) digits is 8960, while the sum is 28.

The square root of 400247245 is about 20006.1801701374. The cubic root of 400247245 is about 736.9580781883.

Adding to 400247245 its reverse (542742004), we get a palindrome (942989249).

The spelling of 400247245 in words is "four hundred million, two hundred forty-seven thousand, two hundred forty-five".