1438890 has 16 divisors (see below), whose sum is σ = 3453408. Its totient is φ = 383696.

The previous prime is 1438883. The next prime is 1438891. The reversal of 1438890 is 988341.

It is not an unprimeable number, because it can be changed into a prime (1438891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23952 + ... + 24011.

It is an arithmetic number, because the mean of its divisors is an integer number (215838).

2^1438890 is an apocalyptic number.

1438890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1438890 is an abundant number, since it is smaller than the sum of its proper divisors (2014518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1438890 is a wasteful number, since it uses less digits than its factorization.

1438890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47973.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 1438890 is about 1199.5374108380. The cubic root of 1438890 is about 112.8953007297.

The spelling of 1438890 in words is "one million, four hundred thirty-eight thousand, eight hundred ninety".