1209413840 has 40 divisors (see below), whose sum is σ = 2959884960. Its totient is φ = 458303616.

The previous prime is 1209413827. The next prime is 1209413869. The reversal of 1209413840 is 483149021.

It is a happy number.

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

It is a super-3 number, since 3×1209413840³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1209413797 and 1209413806.

It is a congruent number.

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, 396314 + ... + 399353.

It is an arithmetic number, because the mean of its divisors is an integer number (73997124).

Almost surely, 2^1209413840 is an apocalyptic number.

1209413840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1209413840 is an abundant number, since it is smaller than the sum of its proper divisors (1750471120).

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

1209413840 is a wasteful number, since it uses less digits than its factorization.

1209413840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795699 (or 795693 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 1209413840 is about 34776.6277836135. The cubic root of 1209413840 is about 1065.4301391648.

The spelling of 1209413840 in words is "one billion, two hundred nine million, four hundred thirteen thousand, eight hundred forty".