40406647 has 2 divisors, whose sum is σ = 40406648. Its totient is φ = 40406646.

The previous prime is 40406633. The next prime is 40406659. The reversal of 40406647 is 74660404.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40406647 is a prime.

It is a Chen prime.

It is equal to p_2456941 and since 40406647 and 2456941 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40406677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20203323 + 20203324.

It is an arithmetic number, because the mean of its divisors is an integer number (20203324).

Almost surely, 2^40406647 is an apocalyptic number.

40406647 is a deficient number, since it is larger than the sum of its proper divisors (1).

40406647 is an equidigital number, since it uses as much as digits as its factorization.

40406647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 40406647 is about 6356.6222948984. The cubic root of 40406647 is about 343.1502117278.

The spelling of 40406647 in words is "forty million, four hundred six thousand, six hundred forty-seven".