1631399 has 8 divisors (see below), whose sum is σ = 2034048. Its totient is φ = 1271160.

The previous prime is 1631369. The next prime is 1631407. The reversal of 1631399 is 9931361.

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

It is not a de Polignac number, because 1631399 - 2⁸ = 1631143 is a prime.

It is a super-2 number, since 2×1631399² = 5322925394402, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631309) 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, 10517 + ... + 10670.

It is an arithmetic number, because the mean of its divisors is an integer number (254256).

2^1631399 is an apocalyptic number.

1631399 is a deficient number, since it is larger than the sum of its proper divisors (402649).

1631399 is a wasteful number, since it uses less digits than its factorization.

1631399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21205.

The product of its digits is 4374, while the sum is 32.

The square root of 1631399 is about 1277.2623066544. The cubic root of 1631399 is about 117.7208521696.

The spelling of 1631399 in words is "one million, six hundred thirty-one thousand, three hundred ninety-nine".