1396999969 has 2 divisors, whose sum is σ = 1396999970. Its totient is φ = 1396999968.

The previous prime is 1396999943. The next prime is 1396999993. The reversal of 1396999969 is 9699996931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 816816400 + 580183569 = 28580^2 + 24087^2 .

It is a cyclic number.

It is not a de Polignac number, because 1396999969 - 2²⁵ = 1363445537 is a prime.

It is a super-2 number, since 2×1396999969² = 3903217826772001922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1396999898 and 1396999907.

It is not a weakly prime, because it can be changed into another prime (1396999999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698499984 + 698499985.

It is an arithmetic number, because the mean of its divisors is an integer number (698499985).

Almost surely, 2^1396999969 is an apocalyptic number.

It is an amenable number.

1396999969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1396999969 is an equidigital number, since it uses as much as digits as its factorization.

1396999969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57395628, while the sum is 70.

The square root of 1396999969 is about 37376.4627673620. The cubic root of 1396999969 is about 1117.8892988424.

The spelling of 1396999969 in words is "one billion, three hundred ninety-six million, nine hundred ninety-nine thousand, nine hundred sixty-nine".