990997394 has 16 divisors (see below), whose sum is σ = 1512734400. Its totient is φ = 486764304.

The previous prime is 990997369. The next prime is 990997433. The reversal of 990997394 is 493799099.

990997394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a Curzon 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, 339212 + ... + 342120.

It is an arithmetic number, because the mean of its divisors is an integer number (94545900).

Almost surely, 2^990997394 is an apocalyptic number.

990997394 is a deficient number, since it is larger than the sum of its proper divisors (521737006).

990997394 is a wasteful number, since it uses less digits than its factorization.

990997394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5857.

The product of its (nonzero) digits is 4960116, while the sum is 59.

The square root of 990997394 is about 31480.1110862081. Note that the first 3 decimals coincide. The cubic root of 990997394 is about 996.9900808094.

The spelling of 990997394 in words is "nine hundred ninety million, nine hundred ninety-seven thousand, three hundred ninety-four".