43121457 has 8 divisors (see below), whose sum is σ = 63883680. Its totient is φ = 28747620.

The previous prime is 43121423. The next prime is 43121459. The reversal of 43121457 is 75412134.

It is not a de Polignac number, because 43121457 - 2⁷ = 43121329 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1597091 = 43121457 / (4 + 3 + 1 + 2 + 1 + 4 + 5 + 7).

It is a self number, because there is not a number n which added to its sum of digits gives 43121457.

It is not an unprimeable number, because it can be changed into a prime (43121459) 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, 798519 + ... + 798572.

It is an arithmetic number, because the mean of its divisors is an integer number (7985460).

Almost surely, 2^43121457 is an apocalyptic number.

It is an amenable number.

43121457 is a deficient number, since it is larger than the sum of its proper divisors (20762223).

43121457 is a wasteful number, since it uses less digits than its factorization.

43121457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1597100 (or 1597094 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 43121457 is about 6566.6930033313. The cubic root of 43121457 is about 350.6693503909.

The spelling of 43121457 in words is "forty-three million, one hundred twenty-one thousand, four hundred fifty-seven".