1206409040 has 20 divisors (see below), whose sum is σ = 2804901204. Its totient is φ = 482563584.

The previous prime is 1206409031. The next prime is 1206409081. The reversal of 1206409040 is 409046021.

It can be written as a sum of positive squares in 2 ways, for example, as 407555344 + 798853696 = 20188^2 + 28264^2 .

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

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7539977 + ... + 7540136.

Almost surely, 2^1206409040 is an apocalyptic number.

1206409040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1206409040 is an abundant number, since it is smaller than the sum of its proper divisors (1598492164).

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

1206409040 is a wasteful number, since it uses less digits than its factorization.

1206409040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15080126 (or 15080120 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1206409040 is about 34733.3994881008. The cubic root of 1206409040 is about 1064.5470503636.

The spelling of 1206409040 in words is "one billion, two hundred six million, four hundred nine thousand, forty".