670400639 has 2 divisors, whose sum is σ = 670400640. Its totient is φ = 670400638.

The previous prime is 670400629. The next prime is 670400677. The reversal of 670400639 is 936004076.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 670400639 - 2⁴ = 670400623 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 670400599 and 670400608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (670400609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335200319 + 335200320.

It is an arithmetic number, because the mean of its divisors is an integer number (335200320).

Almost surely, 2^670400639 is an apocalyptic number.

670400639 is a deficient number, since it is larger than the sum of its proper divisors (1).

670400639 is an equidigital number, since it uses as much as digits as its factorization.

670400639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 670400639 is about 25892.0960719676. The cubic root of 670400639 is about 875.2083918344.

The spelling of 670400639 in words is "six hundred seventy million, four hundred thousand, six hundred thirty-nine".