16172401 has 24 divisors (see below), whose sum is σ = 20520000. Its totient is φ = 12658464.

The previous prime is 16172383. The next prime is 16172407. The reversal of 16172401 is 10427161.

It is not a de Polignac number, because 16172401 - 2⁵ = 16172369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16172407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26700 + ... + 27298.

It is an arithmetic number, because the mean of its divisors is an integer number (855000).

Almost surely, 2^16172401 is an apocalyptic number.

It is an amenable number.

16172401 is a deficient number, since it is larger than the sum of its proper divisors (4347599).

16172401 is a wasteful number, since it uses less digits than its factorization.

16172401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 16172401 is about 4021.4923846751. The cubic root of 16172401 is about 252.8860271848.

Adding to 16172401 its reverse (10427161), we get a palindrome (26599562).

The spelling of 16172401 in words is "sixteen million, one hundred seventy-two thousand, four hundred one".