1990215938 has 8 divisors (see below), whose sum is σ = 3005094720. Its totient is φ = 988517700.

The previous prime is 1990215937. The next prime is 1990215979. The reversal of 1990215938 is 8395120991.

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

It is a junction number, because it is equal to n+sod(n) for n = 1990215892 and 1990215901.

It is not an unprimeable number, because it can be changed into a prime (1990215937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3294758 + ... + 3295361.

It is an arithmetic number, because the mean of its divisors is an integer number (375636840).

Almost surely, 2^1990215938 is an apocalyptic number.

1990215938 is a deficient number, since it is larger than the sum of its proper divisors (1014878782).

1990215938 is a wasteful number, since it uses less digits than its factorization.

1990215938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6590272.

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 1990215938 is about 44611.8362993500. The cubic root of 1990215938 is about 1257.8631662164.

The spelling of 1990215938 in words is "one billion, nine hundred ninety million, two hundred fifteen thousand, nine hundred thirty-eight".