401539 has 2 divisors, whose sum is σ = 401540. Its totient is φ = 401538.
The previous prime is 401537. The next prime is 401551. The reversal of 401539 is 935104.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 401539 - 21 = 401537 is a prime.
It is a super-2 number, since 2×4015392 = 322467137042, which contains 22 as substring.
Together with 401537, it forms a pair of twin primes.
It is not a weakly prime, because it can be changed into another prime (401537) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200769 + 200770.
It is an arithmetic number, because the mean of its divisors is an integer number (200770).
2401539 is an apocalyptic number.
401539 is a deficient number, since it is larger than the sum of its proper divisors (1).
401539 is an equidigital number, since it uses as much as digits as its factorization.
401539 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 540, while the sum is 22.
The square root of 401539 is about 633.6710503092. The cubic root of 401539 is about 73.7750044488.
The spelling of 401539 in words is "four hundred one thousand, five hundred thirty-nine".
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