16407381 has 8 divisors (see below), whose sum is σ = 22385440. Its totient is φ = 10683792.

The previous prime is 16407379. The next prime is 16407383. The reversal of 16407381 is 18370461.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (16407379) and next prime (16407383).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16407381 - 2¹ = 16407379 is a prime.

It is a super-2 number, since 2×16407381² = 538404302558322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16407383) 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, 63466 + ... + 63723.

It is an arithmetic number, because the mean of its divisors is an integer number (2798180).

Almost surely, 2^16407381 is an apocalyptic number.

It is an amenable number.

16407381 is a deficient number, since it is larger than the sum of its proper divisors (5978059).

16407381 is a wasteful number, since it uses less digits than its factorization.

16407381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127235.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 16407381 is about 4050.6025477699. The cubic root of 16407381 is about 254.1049280246.

The spelling of 16407381 in words is "sixteen million, four hundred seven thousand, three hundred eighty-one".