102991404 has 12 divisors (see below), whose sum is σ = 240313304. Its totient is φ = 34330464.

The previous prime is 102991397. The next prime is 102991433. The reversal of 102991404 is 404199201.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

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, 4291297 + ... + 4291320.

Almost surely, 2^102991404 is an apocalyptic number.

It is an amenable number.

102991404 is an abundant number, since it is smaller than the sum of its proper divisors (137321900).

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

102991404 is a wasteful number, since it uses less digits than its factorization.

102991404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8582624 (or 8582622 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 102991404 is about 10148.4680617323. The cubic root of 102991404 is about 468.7417742201.

The spelling of 102991404 in words is "one hundred two million, nine hundred ninety-one thousand, four hundred four".