1890388 has 6 divisors (see below), whose sum is σ = 3308186. Its totient is φ = 945192.

The previous prime is 1890379. The next prime is 1890389. The reversal of 1890388 is 8830981.

It can be written as a sum of positive squares in only one way, i.e., 1855044 + 35344 = 1362^2 + 188^2 .

It is a super-3 number, since 3×1890388³ = 20266283334128673216, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1890389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 236295 + ... + 236302.

2^1890388 is an apocalyptic number.

It is an amenable number.

1890388 is a deficient number, since it is larger than the sum of its proper divisors (1417798).

1890388 is a wasteful number, since it uses less digits than its factorization.

1890388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472601 (or 472599 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 1890388 is about 1374.9138154808. The cubic root of 1890388 is about 123.6470190434.

It can be divided in two parts, 1890 and 388, that added together give a triangular number (2278 = T₆₇).

The spelling of 1890388 in words is "one million, eight hundred ninety thousand, three hundred eighty-eight".