1390957 has 6 divisors (see below), whose sum is σ = 1477898. Its totient is φ = 1308864.

The previous prime is 1390937. The next prime is 1390967. The reversal of 1390957 is 7590931.

It can be written as a sum of positive squares in 3 ways, for example, as 741321 + 649636 = 861^2 + 806^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1390957 is a prime.

It is a super-2 number, since 2×1390957² = 3869522751698, which contains 22 as substring.

It is a Duffinian number.

1390957 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390937) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2118 + ... + 2695.

2^1390957 is an apocalyptic number.

1390957 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1390957 is a deficient number, since it is larger than the sum of its proper divisors (86941).

1390957 is an equidigital number, since it uses as much as digits as its factorization.

1390957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4847 (or 4830 counting only the distinct ones).

The product of its (nonzero) digits is 8505, while the sum is 34.

The square root of 1390957 is about 1179.3884008248. The cubic root of 1390957 is about 111.6275093517.

The spelling of 1390957 in words is "one million, three hundred ninety thousand, nine hundred fifty-seven".