1861630 has 8 divisors (see below), whose sum is σ = 3350952. Its totient is φ = 744648.

The previous prime is 1861621. The next prime is 1861631. The reversal of 1861630 is 361681.

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

It is a junction number, because it is equal to n+sod(n) for n = 1861595 and 1861604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861631) 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, 93072 + ... + 93091.

It is an arithmetic number, because the mean of its divisors is an integer number (418869).

2^1861630 is an apocalyptic number.

1861630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1861630 is a deficient number, since it is larger than the sum of its proper divisors (1489322).

1861630 is a wasteful number, since it uses less digits than its factorization.

1861630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186170.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1861630 is about 1364.4156258267. The cubic root of 1861630 is about 123.0168086840.

The spelling of 1861630 in words is "one million, eight hundred sixty-one thousand, six hundred thirty".