401399 has 4 divisors (see below), whose sum is σ = 406560. Its totient is φ = 396240.

The previous prime is 401393. The next prime is 401407. The reversal of 401399 is 993104.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 401399 - 2¹² = 397303 is a prime.

It is a super-2 number, since 2×401399² = 322242314402, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 401399.

It is not an unprimeable number, because it can be changed into a prime (401393) 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, 2462 + ... + 2619.

It is an arithmetic number, because the mean of its divisors is an integer number (101640).

2⁴⁰¹³⁹⁹ is an apocalyptic number.

401399 is a deficient number, since it is larger than the sum of its proper divisors (5161).

401399 is an equidigital number, since it uses as much as digits as its factorization.

401399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5160.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 401399 is about 633.5605732683. The cubic root of 401399 is about 73.7664293571.

The spelling of 401399 in words is "four hundred one thousand, three hundred ninety-nine".