1640454367 has 2 divisors, whose sum is σ = 1640454368. Its totient is φ = 1640454366.

The previous prime is 1640454313. The next prime is 1640454377. The reversal of 1640454367 is 7634540461.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640454367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640454377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820227183 + 820227184.

It is an arithmetic number, because the mean of its divisors is an integer number (820227184).

Almost surely, 2^1640454367 is an apocalyptic number.

1640454367 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640454367 is an equidigital number, since it uses as much as digits as its factorization.

1640454367 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 40.

The square root of 1640454367 is about 40502.5229707978. The cubic root of 1640454367 is about 1179.3826050633.

The spelling of 1640454367 in words is "one billion, six hundred forty million, four hundred fifty-four thousand, three hundred sixty-seven".