15400121 has 16 divisors (see below), whose sum is σ = 17409600. Its totient is φ = 13502400.

The previous prime is 15400111. The next prime is 15400159. The reversal of 15400121 is 12100451.

It is a cyclic number.

It is not a de Polignac number, because 15400121 - 2⁶ = 15400057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15400096 and 15400105.

It is not an unprimeable number, because it can be changed into a prime (15400111) 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, 39395 + ... + 39783.

It is an arithmetic number, because the mean of its divisors is an integer number (1088100).

Almost surely, 2^15400121 is an apocalyptic number.

15400121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15400121 is a deficient number, since it is larger than the sum of its proper divisors (2009479).

15400121 is a wasteful number, since it uses less digits than its factorization.

15400121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 15400121 is about 3924.2987908670. The cubic root of 15400121 is about 248.7948450750.

Adding to 15400121 its reverse (12100451), we get a palindrome (27500572).

The spelling of 15400121 in words is "fifteen million, four hundred thousand, one hundred twenty-one".