1399957 has 8 divisors (see below), whose sum is σ = 1522584. Its totient is φ = 1279488.

The previous prime is 1399943. The next prime is 1399963. The reversal of 1399957 is 7599931.

It can be written as a sum of positive squares in 4 ways, for example, as 40401 + 1359556 = 201^2 + 1166^2 .

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 1399957 - 2¹¹ = 1397909 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399357) 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 7 ways as a sum of consecutive naturals, for example, 993 + ... + 1945.

It is an arithmetic number, because the mean of its divisors is an integer number (190323).

2^1399957 is an apocalyptic number.

It is an amenable number.

1399957 is a deficient number, since it is larger than the sum of its proper divisors (122627).

1399957 is a wasteful number, since it uses less digits than its factorization.

1399957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079.

The product of its digits is 76545, while the sum is 43.

The square root of 1399957 is about 1183.1977856639. The cubic root of 1399957 is about 111.8677488720.

The spelling of 1399957 in words is "one million, three hundred ninety-nine thousand, nine hundred fifty-seven".