1368553840 has 40 divisors (see below), whose sum is σ = 3190353840. Its totient is φ = 545965056.

The previous prime is 1368553799. The next prime is 1368553847. The reversal of 1368553840 is 483558631.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1368553840² = 3745879225957491200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1368553847) 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, 7752 + ... + 52888.

It is an arithmetic number, because the mean of its divisors is an integer number (79758846).

Almost surely, 2^1368553840 is an apocalyptic number.

1368553840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1368553840 is an abundant number, since it is smaller than the sum of its proper divisors (1821800000).

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

1368553840 is a wasteful number, since it uses less digits than its factorization.

1368553840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45529 (or 45523 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 43.

The square root of 1368553840 is about 36993.9703194994. The cubic root of 1368553840 is about 1110.2496097472.

The spelling of 1368553840 in words is "one billion, three hundred sixty-eight million, five hundred fifty-three thousand, eight hundred forty".