40043149 has 2 divisors, whose sum is σ = 40043150. Its totient is φ = 40043148.

The previous prime is 40043141. The next prime is 40043189. The reversal of 40043149 is 94134004.

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 + 126025 = 6318^2 + 355^2 .

It is a cyclic number.

It is not a de Polignac number, because 40043149 - 2³ = 40043141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40043141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20021574 + 20021575.

It is an arithmetic number, because the mean of its divisors is an integer number (20021575).

Almost surely, 2^40043149 is an apocalyptic number.

It is an amenable number.

40043149 is a deficient number, since it is larger than the sum of its proper divisors (1).

40043149 is an equidigital number, since it uses as much as digits as its factorization.

40043149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 40043149 is about 6327.9656288574. The cubic root of 40043149 is about 342.1181180640.

The spelling of 40043149 in words is "forty million, forty-three thousand, one hundred forty-nine".