15997992 has 32 divisors (see below), whose sum is σ = 40596000. Its totient is φ = 5252544.
The previous prime is 15997979. The next prime is 15997999. The reversal of 15997992 is 29979951.
It is not an unprimeable number, because it can be changed into a prime (15997999) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3367 + ... + 6582.
It is an arithmetic number, because the mean of its divisors is an integer number (1268625).
Almost surely, 215997992 is an apocalyptic number.
15997992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.
It is an amenable number.
15997992 is an abundant number, since it is smaller than the sum of its proper divisors (24598008).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
15997992 is a wasteful number, since it uses less digits than its factorization.
15997992 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 10025 (or 10021 counting only the distinct ones).
The product of its digits is 459270, while the sum is 51.
The square root of 15997992 is about 3999.7489921244. The cubic root of 15997992 is about 251.9736681985.
It can be divided in two parts, 1599 and 7992, that added together give a triangular number (9591 = T138).
The spelling of 15997992 in words is "fifteen million, nine hundred ninety-seven thousand, nine hundred ninety-two".
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