1990420619 has 16 divisors (see below), whose sum is σ = 2193644544. Its totient is φ = 1791007200.

The previous prime is 1990420609. The next prime is 1990420633. The reversal of 1990420619 is 9160240991.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1990420619 - 2⁸ = 1990420363 is a prime.

It is a super-2 number, since 2×1990420619² = 7923548481080686322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1990420609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 441752 + ... + 446234.

It is an arithmetic number, because the mean of its divisors is an integer number (137102784).

Almost surely, 2^1990420619 is an apocalyptic number.

1990420619 is a deficient number, since it is larger than the sum of its proper divisors (203223925).

1990420619 is a wasteful number, since it uses less digits than its factorization.

1990420619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4898.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 1990420619 is about 44614.1302616111. The cubic root of 1990420619 is about 1257.9062858029.

The spelling of 1990420619 in words is "one billion, nine hundred ninety million, four hundred twenty thousand, six hundred nineteen".