1400680639 has 2 divisors, whose sum is σ = 1400680640. Its totient is φ = 1400680638.

The previous prime is 1400680637. The next prime is 1400680649. The reversal of 1400680639 is 9360860041.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1400680639 - 2¹ = 1400680637 is a prime.

Together with 1400680637, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1400680598 and 1400680607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1400680637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700340319 + 700340320.

It is an arithmetic number, because the mean of its divisors is an integer number (700340320).

Almost surely, 2^1400680639 is an apocalyptic number.

1400680639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1400680639 is an equidigital number, since it uses as much as digits as its factorization.

1400680639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 1400680639 is about 37425.6681837479. The cubic root of 1400680639 is about 1118.8702039772.

The spelling of 1400680639 in words is "one billion, four hundred million, six hundred eighty thousand, six hundred thirty-nine".