16406390 has 96 divisors (see below), whose sum is σ = 40219200. Its totient is φ = 4688640.

The previous prime is 16406389. The next prime is 16406393. The reversal of 16406390 is 9360461.

16406390 = 536² + 537² + ... + 587².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16406393) 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, 110036 + ... + 110184.

It is an arithmetic number, because the mean of its divisors is an integer number (418950).

Almost surely, 2^16406390 is an apocalyptic number.

16406390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16406390 is an abundant number, since it is smaller than the sum of its proper divisors (23812810).

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

16406390 is a wasteful number, since it uses less digits than its factorization.

16406390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 16406390 is about 4050.4802184432. The cubic root of 16406390 is about 254.0998119724.

The spelling of 16406390 in words is "sixteen million, four hundred six thousand, three hundred ninety".