1263616 has 24 divisors (see below), whose sum is σ = 2530710. Its totient is φ = 630784.

The previous prime is 1263607. The next prime is 1263629. The reversal of 1263616 is 6163621.

It can be written as a sum of positive squares in only one way, i.e., 1254400 + 9216 = 1120^2 + 96^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1740 + ... + 2356.

2^1263616 is an apocalyptic number.

1263616 is a gapful number since it is divisible by the number (16) 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 1263616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1265355).

1263616 is an abundant number, since it is smaller than the sum of its proper divisors (1267094).

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

1263616 is an frugal number, since it uses more digits than its factorization.

1263616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639 (or 619 counting only the distinct ones).

The product of its digits is 1296, while the sum is 25.

The square root of 1263616 is about 1124.1067564960. The cubic root of 1263616 is about 108.1114533019. Note that the first 3 decimals are identical.

The spelling of 1263616 in words is "one million, two hundred sixty-three thousand, six hundred sixteen".