1264638 has 8 divisors (see below), whose sum is σ = 2529288. Its totient is φ = 421544.

The previous prime is 1264607. The next prime is 1264643. The reversal of 1264638 is 8364621.

It is a sphenic number, since it is the product of 3 distinct primes.

1264638 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105381 + ... + 105392.

It is an arithmetic number, because the mean of its divisors is an integer number (316161).

2^1264638 is an apocalyptic number.

1264638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1264638 is a wasteful number, since it uses less digits than its factorization.

1264638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210778.

The product of its digits is 6912, while the sum is 30.

The square root of 1264638 is about 1124.5612477762. The cubic root of 1264638 is about 108.1405919355.

The spelling of 1264638 in words is "one million, two hundred sixty-four thousand, six hundred thirty-eight".