1299640 has 16 divisors (see below), whose sum is σ = 2924280. Its totient is φ = 519840.

The previous prime is 1299637. The next prime is 1299647. The reversal of 1299640 is 469921.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16206 + ... + 16285.

2^1299640 is an apocalyptic number.

1299640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1299640 is an abundant number, since it is smaller than the sum of its proper divisors (1624640).

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

1299640 is a wasteful number, since it uses less digits than its factorization.

1299640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32502 (or 32498 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 1299640 is about 1140.0175437247. The cubic root of 1299640 is about 109.1292129802.

The spelling of 1299640 in words is "one million, two hundred ninety-nine thousand, six hundred forty".