16015401 has 18 divisors (see below), whose sum is σ = 24031722. Its totient is φ = 10672560.

The previous prime is 16015361. The next prime is 16015409. The reversal of 16015401 is 10451061.

It can be written as a sum of positive squares in only one way, i.e., 10497600 + 5517801 = 3240^2 + 2349^2 .

It is not a de Polignac number, because 16015401 - 2⁷ = 16015273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16015409) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5341 + ... + 7781.

Almost surely, 2^16015401 is an apocalyptic number.

It is an amenable number.

16015401 is a deficient number, since it is larger than the sum of its proper divisors (8016321).

16015401 is an frugal number, since it uses more digits than its factorization.

16015401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2465 (or 2444 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 16015401 is about 4001.9246619595. The cubic root of 16015401 is about 252.0650342354.

Adding to 16015401 its reverse (10451061), we get a palindrome (26466462).

The spelling of 16015401 in words is "sixteen million, fifteen thousand, four hundred one".