1351857840 has 40 divisors (see below), whose sum is σ = 4190760048. Its totient is φ = 360495360.

The previous prime is 1351857817. The next prime is 1351857853. The reversal of 1351857840 is 487581531.

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

It is a junction number, because it is equal to n+sod(n) for n = 1351857792 and 1351857801.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2816131 + ... + 2816610.

Almost surely, 2^1351857840 is an apocalyptic number.

1351857840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1351857840 is an abundant number, since it is smaller than the sum of its proper divisors (2838902208).

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

1351857840 is a wasteful number, since it uses less digits than its factorization.

1351857840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5632757 (or 5632751 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 42.

The square root of 1351857840 is about 36767.6194497278. The cubic root of 1351857840 is about 1105.7162054292.

The spelling of 1351857840 in words is "one billion, three hundred fifty-one million, eight hundred fifty-seven thousand, eight hundred forty".