1861604 has 12 divisors (see below), whose sum is σ = 3273984. Its totient is φ = 926184.

The previous prime is 1861591. The next prime is 1861621. The reversal of 1861604 is 4061681.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

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, 152 + ... + 1935.

It is an arithmetic number, because the mean of its divisors is an integer number (272832).

2^1861604 is an apocalyptic number.

It is an amenable number.

1861604 is a deficient number, since it is larger than the sum of its proper divisors (1412380).

1861604 is a wasteful number, since it uses less digits than its factorization.

1861604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2314 (or 2312 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1861604 is about 1364.4060979049. The cubic root of 1861604 is about 123.0162359866.

The spelling of 1861604 in words is "one million, eight hundred sixty-one thousand, six hundred four".