40400149 has 2 divisors, whose sum is σ = 40400150. Its totient is φ = 40400148.

The previous prime is 40400147. The next prime is 40400203. The reversal of 40400149 is 94100404.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39917124 + 483025 = 6318^2 + 695^2 .

It is a cyclic number.

It is not a de Polignac number, because 40400149 - 2¹ = 40400147 is a prime.

Together with 40400147, 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 (40400141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20200074 + 20200075.

It is an arithmetic number, because the mean of its divisors is an integer number (20200075).

Almost surely, 2^40400149 is an apocalyptic number.

It is an amenable number.

40400149 is a deficient number, since it is larger than the sum of its proper divisors (1).

40400149 is an equidigital number, since it uses as much as digits as its factorization.

40400149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 40400149 is about 6356.1111538424. Note that the first 4 decimals coincide. The cubic root of 40400149 is about 343.1318161603.

The spelling of 40400149 in words is "forty million, four hundred thousand, one hundred forty-nine".