361639 has 4 divisors (see below), whose sum is σ = 362920. Its totient is φ = 360360.

The previous prime is 361637. The next prime is 361643. The reversal of 361639 is 936163.

361639 = 243² + 244² + ... + 248².

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 936163 = 239 ⋅3917.

It is a cyclic number.

It is not a de Polignac number, because 361639 - 2¹ = 361637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (361637) 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, 9 + ... + 850.

It is an arithmetic number, because the mean of its divisors is an integer number (90730).

2³⁶¹⁶³⁹ is an apocalyptic number.

361639 is a deficient number, since it is larger than the sum of its proper divisors (1281).

361639 is an equidigital number, since it uses as much as digits as its factorization.

361639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280.

The product of its digits is 2916, while the sum is 28.

The square root of 361639 is about 601.3642822782. The cubic root of 361639 is about 71.2456609649.

It can be divided in two parts, 3616 and 39, that added together give a triangular number (3655 = T₈₅).

The spelling of 361639 in words is "three hundred sixty-one thousand, six hundred thirty-nine".