1263915400 has 48 divisors (see below), whose sum is σ = 3205754640. Its totient is φ = 459604800.

The previous prime is 1263915377. The next prime is 1263915409. The reversal of 1263915400 is 45193621.

It is not an unprimeable number, because it can be changed into a prime (1263915409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 285054 + ... + 289453.

It is an arithmetic number, because the mean of its divisors is an integer number (66786555).

Almost surely, 2^1263915400 is an apocalyptic number.

1263915400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1263915400 is an abundant number, since it is smaller than the sum of its proper divisors (1941839240).

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

1263915400 is a wasteful number, since it uses less digits than its factorization.

1263915400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574534 (or 574525 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1263915400 is about 35551.5878688983. The cubic root of 1263915400 is about 1081.1999123668.

The spelling of 1263915400 in words is "one billion, two hundred sixty-three million, nine hundred fifteen thousand, four hundred".