1369390720 has 64 divisors (see below), whose sum is σ = 3362236200. Its totient is φ = 532942848.

The previous prime is 1369390709. The next prime is 1369390727. The reversal of 1369390720 is 270939631.

It can be written as a sum of positive squares in 4 ways, for example, as 1300035136 + 69355584 = 36056^2 + 8328^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (1369390727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5235 + ... + 52594.

Almost surely, 2^1369390720 is an apocalyptic number.

1369390720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1369390720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1681118100).

1369390720 is an abundant number, since it is smaller than the sum of its proper divisors (1992845480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1369390720 is an equidigital number, since it uses as much as digits as its factorization.

1369390720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57885 (or 57873 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 40.

The square root of 1369390720 is about 37005.2796233186. The cubic root of 1369390720 is about 1110.4758720341.

The spelling of 1369390720 in words is "one billion, three hundred sixty-nine million, three hundred ninety thousand, seven hundred twenty".