101999280 has 40 divisors (see below), whose sum is σ = 316198512. Its totient is φ = 27199744.

The previous prime is 101999231. The next prime is 101999297. The reversal of 101999280 is 82999101.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

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, 212259 + ... + 212738.

Almost surely, 2^101999280 is an apocalyptic number.

101999280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101999280 is an abundant number, since it is smaller than the sum of its proper divisors (214199232).

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

101999280 is a wasteful number, since it uses less digits than its factorization.

101999280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425013 (or 425007 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 101999280 is about 10099.4692929876. The cubic root of 101999280 is about 467.2317734615.

The spelling of 101999280 in words is "one hundred one million, nine hundred ninety-nine thousand, two hundred eighty".