1990193620 has 24 divisors (see below), whose sum is σ = 4222497384. Its totient is φ = 787869696.

The previous prime is 1990193599. The next prime is 1990193633. The reversal of 1990193620 is 263910991.

It can be written as a sum of positive squares in 4 ways, for example, as 403286724 + 1586906896 = 20082^2 + 39836^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 510997 + ... + 514876.

It is an arithmetic number, because the mean of its divisors is an integer number (175937391).

Almost surely, 2^1990193620 is an apocalyptic number.

1990193620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1990193620 is an abundant number, since it is smaller than the sum of its proper divisors (2232303764).

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

1990193620 is a wasteful number, since it uses less digits than its factorization.

1990193620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025979 (or 1025977 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 1990193620 is about 44611.5861632379. The cubic root of 1990193620 is about 1257.8584643656.

The spelling of 1990193620 in words is "one billion, nine hundred ninety million, one hundred ninety-three thousand, six hundred twenty".