1261977600 has 360 divisors, whose sum is σ = 4550680960. Its totient is φ = 306708480.

The previous prime is 1261977571. The next prime is 1261977637. The reversal of 1261977600 is 67791621.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15974361 + ... + 15974439.

Almost surely, 2^1261977600 is an apocalyptic number.

1261977600 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 1261977600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2275340480).

1261977600 is an abundant number, since it is smaller than the sum of its proper divisors (3288703360).

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

1261977600 is an equidigital number, since it uses as much as digits as its factorization.

1261977600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 102 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 1261977600 is about 35524.3240611275. The cubic root of 1261977600 is about 1080.6470745095.

The spelling of 1261977600 in words is "one billion, two hundred sixty-one million, nine hundred seventy-seven thousand, six hundred".