15478781397 has 8 divisors (see below), whose sum is σ = 20648686944. Its totient is φ = 10314031728.

The previous prime is 15478781369. The next prime is 15478781419. The reversal of 15478781397 is 79318787451.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 15478781397 - 2¹⁵ = 15478748629 is a prime.

It is a super-2 number, since 2×15478781397² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15478781397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15478781327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1281958 + ... + 1293975.

It is an arithmetic number, because the mean of its divisors is an integer number (2581085868).

Almost surely, 2^15478781397 is an apocalyptic number.

It is an amenable number.

15478781397 is a deficient number, since it is larger than the sum of its proper divisors (5169905547).

15478781397 is a wasteful number, since it uses less digits than its factorization.

15478781397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2577939.

The product of its digits is 11854080, while the sum is 60.

The spelling of 15478781397 in words is "fifteen billion, four hundred seventy-eight million, seven hundred eighty-one thousand, three hundred ninety-seven".