400013245 has 4 divisors (see below), whose sum is σ = 480015900. Its totient is φ = 320010592.

The previous prime is 400013239. The next prime is 400013279. The reversal of 400013245 is 542310004.

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 129640996 + 270372249 = 11386^2 + 16443^2 .

It is a cyclic number.

It is not a de Polignac number, because 400013245 - 2¹⁷ = 399882173 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40001320 + ... + 40001329.

It is an arithmetic number, because the mean of its divisors is an integer number (120003975).

Almost surely, 2^400013245 is an apocalyptic number.

It is an amenable number.

400013245 is a deficient number, since it is larger than the sum of its proper divisors (80002655).

400013245 is an equidigital number, since it uses as much as digits as its factorization.

400013245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80002654.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 400013245 is about 20000.3311222590. The cubic root of 400013245 is about 736.8144321378.

Adding to 400013245 its reverse (542310004), we get a palindrome (942323249).

The spelling of 400013245 in words is "four hundred million, thirteen thousand, two hundred forty-five".