1890460638 has 48 divisors (see below), whose sum is σ = 4541642352. Its totient is φ = 563472000.

The previous prime is 1890460601. The next prime is 1890460667. The reversal of 1890460638 is 8360640981.

1890460638 is a `hidden beast` number, since 1 + 8 + 9 + 0 + 4 + 6 + 0 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1890460593 and 1890460602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66183 + ... + 90338.

It is an arithmetic number, because the mean of its divisors is an integer number (94617549).

Almost surely, 2^1890460638 is an apocalyptic number.

1890460638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1890460638 is an abundant number, since it is smaller than the sum of its proper divisors (2651181714).

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

1890460638 is a wasteful number, since it uses less digits than its factorization.

1890460638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156601 (or 156598 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 1890460638 is about 43479.4277561239. The cubic root of 1890460638 is about 1236.4860273187.

The spelling of 1890460638 in words is "one billion, eight hundred ninety million, four hundred sixty thousand, six hundred thirty-eight".