105731890 has 32 divisors (see below), whose sum is σ = 209044800. Its totient is φ = 38184000.

The previous prime is 105731887. The next prime is 105731921. The reversal of 105731890 is 98137501.

It is a happy number.

It is a super-2 number, since 2×105731890² = 22358465125944200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13165 + ... + 19615.

It is an arithmetic number, because the mean of its divisors is an integer number (6532650).

Almost surely, 2^105731890 is an apocalyptic number.

105731890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

105731890 is a deficient number, since it is larger than the sum of its proper divisors (103312910).

105731890 is a wasteful number, since it uses less digits than its factorization.

105731890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6618.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 105731890 is about 10282.6013245676. The cubic root of 105731890 is about 472.8629984919.

The spelling of 105731890 in words is "one hundred five million, seven hundred thirty-one thousand, eight hundred ninety".