361890 has 24 divisors (see below), whose sum is σ = 941148. Its totient is φ = 96480.

The previous prime is 361877. The next prime is 361901. The reversal of 361890 is 98163.

It can be written as a sum of positive squares in 2 ways, for example, as 321489 + 40401 = 567^2 + 201^2 .

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1921 + ... + 2100.

2³⁶¹⁸⁹⁰ is an apocalyptic number.

361890 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

361890 is an abundant number, since it is smaller than the sum of its proper divisors (579258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

361890 is a wasteful number, since it uses less digits than its factorization.

361890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4034 (or 4031 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 361890 is about 601.5729382211. The cubic root of 361890 is about 71.2621401290.

The spelling of 361890 in words is "three hundred sixty-one thousand, eight hundred ninety".