1239664 has 10 divisors (see below), whose sum is σ = 2401880. Its totient is φ = 619824.

The previous prime is 1239661. The next prime is 1239671. The reversal of 1239664 is 4669321.

It is a zygodrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1239661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38724 + ... + 38755.

It is an arithmetic number, because the mean of its divisors is an integer number (240188).

2^1239664 is an apocalyptic number.

It is an amenable number.

1239664 is a deficient number, since it is larger than the sum of its proper divisors (1162216).

1239664 is an equidigital number, since it uses as much as digits as its factorization.

1239664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77487 (or 77481 counting only the distinct ones).

The product of its digits is 7776, while the sum is 31.

The square root of 1239664 is about 1113.4019938908. The cubic root of 1239664 is about 107.4240025326.

The spelling of 1239664 in words is "one million, two hundred thirty-nine thousand, six hundred sixty-four".