400615213 has 2 divisors, whose sum is σ = 400615214. Its totient is φ = 400615212.

The previous prime is 400615211. The next prime is 400615249. The reversal of 400615213 is 312516004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 396686889 + 3928324 = 19917^2 + 1982^2 .

It is a cyclic number.

It is not a de Polignac number, because 400615213 - 2¹ = 400615211 is a prime.

Together with 400615211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400615211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200307606 + 200307607.

It is an arithmetic number, because the mean of its divisors is an integer number (200307607).

Almost surely, 2^400615213 is an apocalyptic number.

It is an amenable number.

400615213 is a deficient number, since it is larger than the sum of its proper divisors (1).

400615213 is an equidigital number, since it uses as much as digits as its factorization.

400615213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 400615213 is about 20015.3744156836. The cubic root of 400615213 is about 737.1838502443.

The spelling of 400615213 in words is "four hundred million, six hundred fifteen thousand, two hundred thirteen".