15400401 has 16 divisors (see below), whose sum is σ = 20987904. Its totient is φ = 10042704.

The previous prime is 15400391. The next prime is 15400433. The reversal of 15400401 is 10400451.

It is not a de Polignac number, because 15400401 - 2⁶ = 15400337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15400481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31380 + ... + 31866.

It is an arithmetic number, because the mean of its divisors is an integer number (1311744).

Almost surely, 2^15400401 is an apocalyptic number.

It is an amenable number.

15400401 is a deficient number, since it is larger than the sum of its proper divisors (5587503).

15400401 is a wasteful number, since it uses less digits than its factorization.

15400401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 15400401 is about 3924.3344658681. The cubic root of 15400401 is about 248.7963529016.

Adding to 15400401 its reverse (10400451), we get a palindrome (25800852).

The spelling of 15400401 in words is "fifteen million, four hundred thousand, four hundred one".