1399969 has 8 divisors (see below), whose sum is σ = 1452968. Its totient is φ = 1347840.

The previous prime is 1399963. The next prime is 1399999. The reversal of 1399969 is 9699931.

It can be written as a sum of positive squares in 4 ways, for example, as 506944 + 893025 = 712^2 + 945^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1399969 - 2¹⁹ = 875681 is a prime.

It is a super-2 number, since 2×1399969² = 3919826401922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1399963) 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, 5689 + ... + 5929.

It is an arithmetic number, because the mean of its divisors is an integer number (181621).

2^1399969 is an apocalyptic number.

It is an amenable number.

1399969 is a deficient number, since it is larger than the sum of its proper divisors (52999).

1399969 is a wasteful number, since it uses less digits than its factorization.

1399969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435.

The product of its digits is 118098, while the sum is 46.

The square root of 1399969 is about 1183.2028566565. The cubic root of 1399969 is about 111.8680685031.

The spelling of 1399969 in words is "one million, three hundred ninety-nine thousand, nine hundred sixty-nine".