15400897 has 2 divisors, whose sum is σ = 15400898. Its totient is φ = 15400896.

The previous prime is 15400877. The next prime is 15400939. The reversal of 15400897 is 79800451.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15295921 + 104976 = 3911^2 + 324^2 .

It is an emirp because it is prime and its reverse (79800451) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15400897 is a prime.

It is not a weakly prime, because it can be changed into another prime (15400807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7700448 + 7700449.

It is an arithmetic number, because the mean of its divisors is an integer number (7700449).

Almost surely, 2^15400897 is an apocalyptic number.

It is an amenable number.

15400897 is a deficient number, since it is larger than the sum of its proper divisors (1).

15400897 is an equidigital number, since it uses as much as digits as its factorization.

15400897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 15400897 is about 3924.3976607882. The cubic root of 15400897 is about 248.7990238638.

The spelling of 15400897 in words is "fifteen million, four hundred thousand, eight hundred ninety-seven".