1299940 has 12 divisors (see below), whose sum is σ = 2729916. Its totient is φ = 519968.

The previous prime is 1299919. The next prime is 1299941. The reversal of 1299940 is 499921.

It can be written as a sum of positive squares in 2 ways, for example, as 295936 + 1004004 = 544^2 + 1002^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1299896 and 1299905.

It is not an unprimeable number, because it can be changed into a prime (1299941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32479 + ... + 32518.

It is an arithmetic number, because the mean of its divisors is an integer number (227493).

2^1299940 is an apocalyptic number.

1299940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1299940 is an abundant number, since it is smaller than the sum of its proper divisors (1429976).

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

1299940 is a wasteful number, since it uses less digits than its factorization.

1299940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65006 (or 65004 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 1299940 is about 1140.1491130550. The cubic root of 1299940 is about 109.1376092143.

The spelling of 1299940 in words is "one million, two hundred ninety-nine thousand, nine hundred forty".