3638890 has 8 divisors (see below), whose sum is σ = 6550020. Its totient is φ = 1455552.

The previous prime is 3638879. The next prime is 3638903. The reversal of 3638890 is 988363.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2954961 + 683929 = 1719^2 + 827^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181935 + ... + 181954.

Almost surely, 2^3638890 is an apocalyptic number.

3638890 is a deficient number, since it is larger than the sum of its proper divisors (2911130).

3638890 is a wasteful number, since it uses less digits than its factorization.

3638890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363896.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 3638890 is about 1907.5874816113. The cubic root of 3638890 is about 153.8117957249.

It can be divided in two parts, 363 and 8890, that multiplied together give a triangular number (3227070 = T₂₅₄₀).

The spelling of 3638890 in words is "three million, six hundred thirty-eight thousand, eight hundred ninety".