40708649 has 2 divisors, whose sum is σ = 40708650. Its totient is φ = 40708648.

The previous prime is 40708637. The next prime is 40708651. The reversal of 40708649 is 94680704.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40386025 + 322624 = 6355^2 + 568^2 .

It is a cyclic number.

It is not a de Polignac number, because 40708649 - 2²⁴ = 23931433 is a prime.

Together with 40708651, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40708699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20354324 + 20354325.

It is an arithmetic number, because the mean of its divisors is an integer number (20354325).

Almost surely, 2^40708649 is an apocalyptic number.

It is an amenable number.

40708649 is a deficient number, since it is larger than the sum of its proper divisors (1).

40708649 is an equidigital number, since it uses as much as digits as its factorization.

40708649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 40708649 is about 6380.3329850408. The cubic root of 40708649 is about 344.0029999062.

The spelling of 40708649 in words is "forty million, seven hundred eight thousand, six hundred forty-nine".