1900985021 has 16 divisors (see below), whose sum is σ = 2059452864. Its totient is φ = 1744305024.

The previous prime is 1900984993. The next prime is 1900985041. The reversal of 1900985021 is 1205890091.

It is a cyclic number.

It is not a de Polignac number, because 1900985021 - 2⁶ = 1900984957 is a prime.

It is a super-2 number, since 2×1900985021² = 7227488100132740882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1900985041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2782946 + ... + 2783628.

It is an arithmetic number, because the mean of its divisors is an integer number (128715804).

Almost surely, 2^1900985021 is an apocalyptic number.

It is an amenable number.

1900985021 is a deficient number, since it is larger than the sum of its proper divisors (158467843).

1900985021 is a wasteful number, since it uses less digits than its factorization.

1900985021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 1900985021 is about 43600.2869371292. The cubic root of 1900985021 is about 1238.7763294783.

The spelling of 1900985021 in words is "one billion, nine hundred million, nine hundred eighty-five thousand, twenty-one".