1990040730 has 32 divisors (see below), whose sum is σ = 4983755904. Its totient is φ = 507604416.

The previous prime is 1990040729. The next prime is 1990040737. The reversal of 1990040730 is 370400991.

It is a junction number, because it is equal to n+sod(n) for n = 1990040691 and 1990040700.

It is not an unprimeable number, because it can be changed into a prime (1990040737) 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, 1441369 + ... + 1442748.

It is an arithmetic number, because the mean of its divisors is an integer number (155742372).

Almost surely, 2^1990040730 is an apocalyptic number.

1990040730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1990040730 is an abundant number, since it is smaller than the sum of its proper divisors (2993715174).

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

1990040730 is a wasteful number, since it uses less digits than its factorization.

1990040730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2884150.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 1990040730 is about 44609.8725620238. The cubic root of 1990040730 is about 1257.8262532776.

The spelling of 1990040730 in words is "one billion, nine hundred ninety million, forty thousand, seven hundred thirty".