10721840 has 40 divisors (see below), whose sum is σ = 25081728. Its totient is φ = 4262400.

The previous prime is 10721831. The next prime is 10721861. The reversal of 10721840 is 4812701.

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

It is a super-2 number, since 2×10721840² = 229915705971200, which contains 22 as substring.

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, 17540 + ... + 18140.

Almost surely, 2^10721840 is an apocalyptic number.

10721840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10721840 is an abundant number, since it is smaller than the sum of its proper divisors (14359888).

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

10721840 is a wasteful number, since it uses less digits than its factorization.

10721840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837 (or 831 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 10721840 is about 3274.4220864146. The cubic root of 10721840 is about 220.5073689398.

The spelling of 10721840 in words is "ten million, seven hundred twenty-one thousand, eight hundred forty".