43621577397 has 12 divisors (see below), whose sum is σ = 66715353900. Its totient is φ = 27370401408.

The previous prime is 43621577347. The next prime is 43621577399. The reversal of 43621577397 is 79377512634.

43621577397 is a `hidden beast` number, since 4 + 3 + 62 + 1 + 577 + 3 + 9 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14516876196 + 29104701201 = 120486^2 + 170601^2 .

It is not a de Polignac number, because 43621577397 - 2⁸ = 43621577141 is a prime.

It is a super-2 number, since 2×43621577397² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43621577399) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142554022 + ... + 142554327.

It is an arithmetic number, because the mean of its divisors is an integer number (5559612825).

Almost surely, 2^43621577397 is an apocalyptic number.

It is an amenable number.

43621577397 is a deficient number, since it is larger than the sum of its proper divisors (23093776503).

43621577397 is a wasteful number, since it uses less digits than its factorization.

43621577397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285108372 (or 285108369 counting only the distinct ones).

The product of its digits is 6667920, while the sum is 54.

The spelling of 43621577397 in words is "forty-three billion, six hundred twenty-one million, five hundred seventy-seven thousand, three hundred ninety-seven".