1351804240 has 20 divisors (see below), whose sum is σ = 3142945044. Its totient is φ = 540721664.

The previous prime is 1351804211. The next prime is 1351804247. The reversal of 1351804240 is 424081531.

It can be written as a sum of positive squares in 2 ways, for example, as 168169024 + 1183635216 = 12968^2 + 34404^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 1351804199 and 1351804208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1351804247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8448697 + ... + 8448856.

Almost surely, 2^1351804240 is an apocalyptic number.

1351804240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1351804240 is an abundant number, since it is smaller than the sum of its proper divisors (1791140804).

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

1351804240 is a wasteful number, since it uses less digits than its factorization.

1351804240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16897566 (or 16897560 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 1351804240 is about 36766.8905402673. The cubic root of 1351804240 is about 1105.7015916707.

Adding to 1351804240 its reverse (424081531), we get a palindrome (1775885771).

The spelling of 1351804240 in words is "one billion, three hundred fifty-one million, eight hundred four thousand, two hundred forty".