1478211397 has 6 divisors (see below), whose sum is σ = 1600666962. Its totient is φ = 1364502672.

The previous prime is 1478211391. The next prime is 1478211407. The reversal of 1478211397 is 7931128741.

It can be written as a sum of positive squares in 3 ways, for example, as 155725441 + 1322485956 = 12479^2 + 36366^2 .

It is not a de Polignac number, because 1478211397 - 2³ = 1478211389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1478211391) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4373238 + ... + 4373575.

It is an arithmetic number, because the mean of its divisors is an integer number (266777827).

Almost surely, 2^1478211397 is an apocalyptic number.

It is an amenable number.

1478211397 is a deficient number, since it is larger than the sum of its proper divisors (122455565).

1478211397 is an equidigital number, since it uses as much as digits as its factorization.

1478211397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8746839 (or 8746826 counting only the distinct ones).

The product of its digits is 84672, while the sum is 43.

The square root of 1478211397 is about 38447.5148351620. The cubic root of 1478211397 is about 1139.1445816850.

The spelling of 1478211397 in words is "one billion, four hundred seventy-eight million, two hundred eleven thousand, three hundred ninety-seven".