991907004 has 24 divisors (see below), whose sum is σ = 2524854528. Its totient is φ = 300577840.

The previous prime is 991906999. The next prime is 991907011. The reversal of 991907004 is 400709199.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

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, 3757092 + ... + 3757355.

It is an arithmetic number, because the mean of its divisors is an integer number (105202272).

Almost surely, 2^991907004 is an apocalyptic number.

It is an amenable number.

991907004 is an abundant number, since it is smaller than the sum of its proper divisors (1532947524).

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

991907004 is a wasteful number, since it uses less digits than its factorization.

991907004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7514465 (or 7514463 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 991907004 is about 31494.5551484697. Note that the first 3 decimals coincide. The cubic root of 991907004 is about 997.2950243709.

The spelling of 991907004 in words is "nine hundred ninety-one million, nine hundred seven thousand, four".