16040640 has 336 divisors, whose sum is σ = 66714624. Its totient is φ = 3225600.

The previous prime is 16040611. The next prime is 16040641. The reversal of 16040640 is 4604061.

16040640 = T₁₂₀ + T₁₂₁ + ... + T₄₆₀.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16040641) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 517425 + ... + 517455.

Almost surely, 2^16040640 is an apocalyptic number.

16040640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16040640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33357312).

16040640 is an abundant number, since it is smaller than the sum of its proper divisors (50673984).

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

16040640 is a wasteful number, since it uses less digits than its factorization.

16040640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76 (or 59 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 16040640 is about 4005.0767782903. The cubic root of 16040640 is about 252.1973762311.

The spelling of 16040640 in words is "sixteen million, forty thousand, six hundred forty".