1947138465 has 8 divisors (see below), whose sum is σ = 3115421568. Its totient is φ = 1038473840.

The previous prime is 1947138463. The next prime is 1947138467. The reversal of 1947138465 is 5648317491.

1947138465 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1947138463) and next prime (1947138467).

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

It is not a de Polignac number, because 1947138465 - 2¹ = 1947138463 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1947138461) 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, 64904601 + ... + 64904630.

It is an arithmetic number, because the mean of its divisors is an integer number (389427696).

Almost surely, 2^1947138465 is an apocalyptic number.

1947138465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1947138465 is a deficient number, since it is larger than the sum of its proper divisors (1168283103).

1947138465 is a wasteful number, since it uses less digits than its factorization.

1947138465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129809239.

The product of its digits is 725760, while the sum is 48.

The square root of 1947138465 is about 44126.3919327198. The cubic root of 1947138465 is about 1248.7215654632.

The spelling of 1947138465 in words is "one billion, nine hundred forty-seven million, one hundred thirty-eight thousand, four hundred sixty-five".