1890400284 has 36 divisors (see below), whose sum is σ = 4895064720. Its totient is φ = 614763840.

The previous prime is 1890400279. The next prime is 1890400321. The reversal of 1890400284 is 4820040981.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1890400284² = 7147226467494561312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 638904 + ... + 641855.

It is an arithmetic number, because the mean of its divisors is an integer number (135974020).

Almost surely, 2^1890400284 is an apocalyptic number.

It is an amenable number.

1890400284 is an abundant number, since it is smaller than the sum of its proper divisors (3004664436).

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

1890400284 is a wasteful number, since it uses less digits than its factorization.

1890400284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280810 (or 1280805 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 1890400284 is about 43478.7336982116. The cubic root of 1890400284 is about 1236.4728686789.

The spelling of 1890400284 in words is "one billion, eight hundred ninety million, four hundred thousand, two hundred eighty-four".