1263400516 has 72 divisors (see below), whose sum is σ = 2734905600. Its totient is φ = 507729600.

The previous prime is 1263400499. The next prime is 1263400517. The reversal of 1263400516 is 6150043621.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (1263400517) 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, 374445 + ... + 377803.

It is an arithmetic number, because the mean of its divisors is an integer number (37984800).

Almost surely, 2^1263400516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1263400516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1367452800).

1263400516 is an abundant number, since it is smaller than the sum of its proper divisors (1471505084).

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

1263400516 is a wasteful number, since it uses less digits than its factorization.

1263400516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3497 (or 3488 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1263400516 is about 35544.3457669430. The cubic root of 1263400516 is about 1081.0530754961.

The spelling of 1263400516 in words is "one billion, two hundred sixty-three million, four hundred thousand, five hundred sixteen".