1890400216 has 16 divisors (see below), whose sum is σ = 3571559640. Its totient is φ = 937984320.

The previous prime is 1890400201. The next prime is 1890400223. The reversal of 1890400216 is 6120040981.

It is a happy number.

It is a super-2 number, since 2×1890400216² = 7147225953305693312, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 900861 + ... + 902956.

Almost surely, 2^1890400216 is an apocalyptic number.

It is an amenable number.

1890400216 is a deficient number, since it is larger than the sum of its proper divisors (1681159424).

1890400216 is a wasteful number, since it uses less digits than its factorization.

1890400216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1803954 (or 1803950 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 1890400216 is about 43478.7329162201. The cubic root of 1890400216 is about 1236.4728538531.

The spelling of 1890400216 in words is "one billion, eight hundred ninety million, four hundred thousand, two hundred sixteen".