1209201840 has 480 divisors, whose sum is σ = 5364942336. Its totient is φ = 236298240.

The previous prime is 1209201827. The next prime is 1209201869. The reversal of 1209201840 is 481029021.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 941839 + ... + 943121.

Almost surely, 2^1209201840 is an apocalyptic number.

1209201840 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 1209201840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2682471168).

1209201840 is an abundant number, since it is smaller than the sum of its proper divisors (4155740496).

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

1209201840 is a wasteful number, since it uses less digits than its factorization.

1209201840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337 (or 1328 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1209201840 is about 34773.5796259171. The cubic root of 1209201840 is about 1065.3678819012.

It can be divided in two parts, 120920 and 1840, that added together give a triangular number (122760 = T₄₉₅).

The spelling of 1209201840 in words is "one billion, two hundred nine million, two hundred one thousand, eight hundred forty".