1399401459369 has 27 divisors (see below), whose sum is σ = 2030735604157. Its totient is φ = 928625955000.

The previous prime is 1399401459361. The next prime is 1399401459397. The reversal of 1399401459369 is 9639541049931.

The square root of 1399401459369 is 1182963.

It is a perfect power (a square), and thus also a powerful number.

1399401459369 is a `hidden beast` number, since 1 + 3 + 99 + 40 + 145 + 9 + 369 = 666.

It is not a de Polignac number, because 1399401459369 - 2³ = 1399401459361 is a prime.

It is a super-2 number, since 2×1399401459369² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1399401459361) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 890770354 + ... + 890771924.

Almost surely, 2^{1399401459369} is an apocalyptic number.

1399401459369 is the 1182963-rd square number.

1399401459369 is the 591482-nd centered octagonal number.

It is an amenable number.

1399401459369 is a deficient number, since it is larger than the sum of its proper divisors (631334144788).

1399401459369 is an frugal number, since it uses more digits than its factorization.

1399401459369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3650 (or 1825 counting only the distinct ones).

The product of its (nonzero) digits is 28343520, while the sum is 63.

The spelling of 1399401459369 in words is "one trillion, three hundred ninety-nine billion, four hundred one million, four hundred fifty-nine thousand, three hundred sixty-nine".