1369349840 has 60 divisors (see below), whose sum is σ = 3297470124. Its totient is φ = 528826368.

The previous prime is 1369349833. The next prime is 1369349867. The reversal of 1369349840 is 489439631.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 16875664 + 1352474176 = 4108^2 + 36776^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57104 + ... + 77456.

Almost surely, 2^1369349840 is an apocalyptic number.

1369349840 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 1369349840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1648735062).

1369349840 is an abundant number, since it is smaller than the sum of its proper divisors (1928120284).

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

1369349840 is a wasteful number, since it uses less digits than its factorization.

1369349840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20424 (or 20389 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 47.

The square root of 1369349840 is about 37004.7272655805. The cubic root of 1369349840 is about 1110.4648216926.

The spelling of 1369349840 in words is "one billion, three hundred sixty-nine million, three hundred forty-nine thousand, eight hundred forty".