1261860450 has 48 divisors (see below), whose sum is σ = 3131689440. Its totient is φ = 336251520.

The previous prime is 1261860427. The next prime is 1261860461. The reversal of 1261860450 is 540681621.

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, 311337 + ... + 315363.

It is an arithmetic number, because the mean of its divisors is an integer number (65243530).

Almost surely, 2^1261860450 is an apocalyptic number.

1261860450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261860450 is an abundant number, since it is smaller than the sum of its proper divisors (1869828990).

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

1261860450 is a wasteful number, since it uses less digits than its factorization.

1261860450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6131 (or 6126 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 1261860450 is about 35522.6751526402. The cubic root of 1261860450 is about 1080.6136344752.

The spelling of 1261860450 in words is "one billion, two hundred sixty-one million, eight hundred sixty thousand, four hundred fifty".