1864396545 has 32 divisors (see below), whose sum is σ = 3445649280. Its totient is φ = 850775040.

The previous prime is 1864396543. The next prime is 1864396549. The reversal of 1864396545 is 5456934681.

It is not a de Polignac number, because 1864396545 - 2¹ = 1864396543 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1864396543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 329530 + ... + 335139.

It is an arithmetic number, because the mean of its divisors is an integer number (107676540).

Almost surely, 2^1864396545 is an apocalyptic number.

1864396545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1864396545 is a deficient number, since it is larger than the sum of its proper divisors (1581252735).

1864396545 is a wasteful number, since it uses less digits than its factorization.

1864396545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664705.

The product of its digits is 3110400, while the sum is 51.

The square root of 1864396545 is about 43178.6584437266. The cubic root of 1864396545 is about 1230.7771643484. Note that the first 3 decimals are identical.

The spelling of 1864396545 in words is "one billion, eight hundred sixty-four million, three hundred ninety-six thousand, five hundred forty-five".