400001249 has 2 divisors, whose sum is σ = 400001250. Its totient is φ = 400001248.

The previous prime is 400001233. The next prime is 400001267. The reversal of 400001249 is 942100004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 224041024 + 175960225 = 14968^2 + 13265^2 .

It is a cyclic number.

It is not a de Polignac number, because 400001249 - 2⁴ = 400001233 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400001249.

It is not a weakly prime, because it can be changed into another prime (400001269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200000624 + 200000625.

It is an arithmetic number, because the mean of its divisors is an integer number (200000625).

Almost surely, 2^400001249 is an apocalyptic number.

It is an amenable number.

400001249 is a deficient number, since it is larger than the sum of its proper divisors (1).

400001249 is an equidigital number, since it uses as much as digits as its factorization.

400001249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 400001249 is about 20000.0312249756. The cubic root of 400001249 is about 736.8070666198.

The spelling of 400001249 in words is "four hundred million, one thousand, two hundred forty-nine".