1890002381 has 8 divisors (see below), whose sum is σ = 1901410560. Its totient is φ = 1878620832.

The previous prime is 1890002377. The next prime is 1890002383. The reversal of 1890002381 is 1832000981.

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

It is a cyclic number.

It is not a de Polignac number, because 1890002381 - 2² = 1890002377 is a prime.

It is a super-2 number, since 2×1890002381² = 7144218000371338322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1890002383) 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, 146105 + ... + 158513.

It is an arithmetic number, because the mean of its divisors is an integer number (237676320).

Almost surely, 2^1890002381 is an apocalyptic number.

It is an amenable number.

1890002381 is a deficient number, since it is larger than the sum of its proper divisors (11408179).

1890002381 is a wasteful number, since it uses less digits than its factorization.

1890002381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13315.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 1890002381 is about 43474.1576226613. The cubic root of 1890002381 is about 1236.3861091371.

The spelling of 1890002381 in words is "one billion, eight hundred ninety million, two thousand, three hundred eighty-one".