40451647 has 2 divisors, whose sum is σ = 40451648. Its totient is φ = 40451646.

The previous prime is 40451633. The next prime is 40451651. The reversal of 40451647 is 74615404.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40451647 - 2¹⁵ = 40418879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40451617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20225823 + 20225824.

It is an arithmetic number, because the mean of its divisors is an integer number (20225824).

Almost surely, 2^40451647 is an apocalyptic number.

40451647 is a deficient number, since it is larger than the sum of its proper divisors (1).

40451647 is an equidigital number, since it uses as much as digits as its factorization.

40451647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 40451647 is about 6360.1609256370. The cubic root of 40451647 is about 343.2775507660.

The spelling of 40451647 in words is "forty million, four hundred fifty-one thousand, six hundred forty-seven".