1369657969 has 8 divisors (see below), whose sum is σ = 1373733320. Its totient is φ = 1365590016.

The previous prime is 1369657957. The next prime is 1369657999. The reversal of 1369657969 is 9697569631.

1369657969 = T₁ + T₂ + ... + T₂₀₁₇.

1369657969 is a nontrivial binomial coefficient, being equal to C(2019, 3).

It can be written as a sum of positive squares in 4 ways, for example, as 204118369 + 1165539600 = 14287^2 + 34140^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 5-Lehmer number, since φ(1369657969) divides (1369657969-1)⁵.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1369657969 is a prime.

It is a super-2 number, since 2×1369657969² = 3751925904090409922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1369657909) by changing a digit.

It is the 2017-th tetrahedral number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 678049 + ... + 680065.

It is an arithmetic number, because the mean of its divisors is an integer number (171716665).

Almost surely, 2^1369657969 is an apocalyptic number.

It is an amenable number.

1369657969 is a deficient number, since it is larger than the sum of its proper divisors (4075351).

1369657969 is a wasteful number, since it uses less digits than its factorization.

1369657969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3699.

The product of its digits is 16533720, while the sum is 61.

The square root of 1369657969 is about 37008.8904048743. The cubic root of 1369657969 is about 1110.5481071428.

The spelling of 1369657969 in words is "one billion, three hundred sixty-nine million, six hundred fifty-seven thousand, nine hundred sixty-nine".