1861490 has 8 divisors (see below), whose sum is σ = 3350700. Its totient is φ = 744592.

The previous prime is 1861471. The next prime is 1861493. The reversal of 1861490 is 941681.

It can be written as a sum of positive squares in 2 ways, for example, as 1857769 + 3721 = 1363^2 + 61^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1861493) 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, 93065 + ... + 93084.

2^1861490 is an apocalyptic number.

1861490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1861490 is a deficient number, since it is larger than the sum of its proper divisors (1489210).

1861490 is a wasteful number, since it uses less digits than its factorization.

1861490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186156.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1861490 is about 1364.3643208469. The cubic root of 1861490 is about 123.0137248659.

It can be divided in two parts, 186 and 1490, that multiplied together give a triangular number (277140 = T₇₄₄).

The spelling of 1861490 in words is "one million, eight hundred sixty-one thousand, four hundred ninety".