1260205400 has 96 divisors (see below), whose sum is σ = 3094928400. Its totient is φ = 475891200.

The previous prime is 1260205391. The next prime is 1260205409. The reversal of 1260205400 is 45020621.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1260205391) and next prime (1260205409).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1260205409) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2055494 + ... + 2056106.

Almost surely, 2^1260205400 is an apocalyptic number.

1260205400 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 1260205400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1547464200).

1260205400 is an abundant number, since it is smaller than the sum of its proper divisors (1834723000).

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

1260205400 is a wasteful number, since it uses less digits than its factorization.

1260205400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189 (or 1180 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1260205400 is about 35499.3718254281. The cubic root of 1260205400 is about 1080.1409852527.

The spelling of 1260205400 in words is "one billion, two hundred sixty million, two hundred five thousand, four hundred".