15400855394 has 4 divisors (see below), whose sum is σ = 23101283094. Its totient is φ = 7700427696.

The previous prime is 15400855369. The next prime is 15400855399. The reversal of 15400855394 is 49355800451.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 9075039169 + 6325816225 = 95263^2 + 79535^2 .

It is not an unprimeable number, because it can be changed into a prime (15400855399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3850213847 + ... + 3850213850.

Almost surely, 2^15400855394 is an apocalyptic number.

15400855394 is a deficient number, since it is larger than the sum of its proper divisors (7700427700).

15400855394 is an equidigital number, since it uses as much as digits as its factorization.

15400855394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7700427699.

The product of its (nonzero) digits is 432000, while the sum is 44.

The spelling of 15400855394 in words is "fifteen billion, four hundred million, eight hundred fifty-five thousand, three hundred ninety-four".