1889990 has 8 divisors (see below), whose sum is σ = 3402000. Its totient is φ = 755992.

The previous prime is 1889981. The next prime is 1889999. The reversal of 1889990 is 999881.

It is an interprime number because it is at equal distance from previous prime (1889981) and next prime (1889999).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1889999) 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, 94490 + ... + 94509.

It is an arithmetic number, because the mean of its divisors is an integer number (425250).

2^1889990 is an apocalyptic number.

1889990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1889990 is a deficient number, since it is larger than the sum of its proper divisors (1512010).

1889990 is a wasteful number, since it uses less digits than its factorization.

1889990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189006.

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 1889990 is about 1374.7690715171. The cubic root of 1889990 is about 123.6383409364.

The spelling of 1889990 in words is "one million, eight hundred eighty-nine thousand, nine hundred ninety".