1306638 has 16 divisors (see below), whose sum is σ = 2903760. Its totient is φ = 435528.

The previous prime is 1306633. The next prime is 1306661. The reversal of 1306638 is 8366031.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12045 + ... + 12152.

It is an arithmetic number, because the mean of its divisors is an integer number (181485).

2^1306638 is an apocalyptic number.

1306638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1306638 is an abundant number, since it is smaller than the sum of its proper divisors (1597122).

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

1306638 is a wasteful number, since it uses less digits than its factorization.

1306638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24208 (or 24202 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 1306638 is about 1143.0826741754. The cubic root of 1306638 is about 109.3247336914.

The spelling of 1306638 in words is "one million, three hundred six thousand, six hundred thirty-eight".