400013149 has 2 divisors, whose sum is σ = 400013150. Its totient is φ = 400013148.

The previous prime is 400013147. The next prime is 400013161. The reversal of 400013149 is 941310004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 299913124 + 100100025 = 17318^2 + 10005^2 .

It is a cyclic number.

It is not a de Polignac number, because 400013149 - 2¹ = 400013147 is a prime.

Together with 400013147, 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 (400013143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200006574 + 200006575.

It is an arithmetic number, because the mean of its divisors is an integer number (200006575).

Almost surely, 2^400013149 is an apocalyptic number.

It is an amenable number.

400013149 is a deficient number, since it is larger than the sum of its proper divisors (1).

400013149 is an equidigital number, since it uses as much as digits as its factorization.

400013149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 400013149 is about 20000.3287222985. The cubic root of 400013149 is about 736.8143731946.

The spelling of 400013149 in words is "four hundred million, thirteen thousand, one hundred forty-nine".