16401597 has 8 divisors (see below), whose sum is σ = 21929856. Its totient is φ = 10903872.

The previous prime is 16401589. The next prime is 16401641. The reversal of 16401597 is 79510461.

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

It is not a de Polignac number, because 16401597 - 2³ = 16401589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16401527) 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, 6348 + ... + 8549.

It is an arithmetic number, because the mean of its divisors is an integer number (2741232).

Almost surely, 2^16401597 is an apocalyptic number.

It is an amenable number.

16401597 is a deficient number, since it is larger than the sum of its proper divisors (5528259).

16401597 is a wasteful number, since it uses less digits than its factorization.

16401597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15267.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 16401597 is about 4049.8885169841. Note that the first 3 decimals coincide. The cubic root of 16401597 is about 254.0750651305.

The spelling of 16401597 in words is "sixteen million, four hundred one thousand, five hundred ninety-seven".