1397906623 has 2 divisors, whose sum is σ = 1397906624. Its totient is φ = 1397906622.

The previous prime is 1397906593. The next prime is 1397906689. The reversal of 1397906623 is 3266097931.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1397906623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1397906123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698953311 + 698953312.

It is an arithmetic number, because the mean of its divisors is an integer number (698953312).

Almost surely, 2^1397906623 is an apocalyptic number.

1397906623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397906623 is an equidigital number, since it uses as much as digits as its factorization.

1397906623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 367416, while the sum is 46.

The square root of 1397906623 is about 37388.5894759350. The cubic root of 1397906623 is about 1118.1310835342.

The spelling of 1397906623 in words is "one billion, three hundred ninety-seven million, nine hundred six thousand, six hundred twenty-three".