43873997 has 2 divisors, whose sum is σ = 43873998. Its totient is φ = 43873996.

The previous prime is 43873981. The next prime is 43874009. The reversal of 43873997 is 79937834.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35688676 + 8185321 = 5974^2 + 2861^2 .

It is a cyclic number.

It is not a de Polignac number, because 43873997 - 2⁴ = 43873981 is a prime.

It is a super-2 number, since 2×43873997² = 3849855225512018, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43873937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21936998 + 21936999.

It is an arithmetic number, because the mean of its divisors is an integer number (21936999).

Almost surely, 2^43873997 is an apocalyptic number.

It is an amenable number.

43873997 is a deficient number, since it is larger than the sum of its proper divisors (1).

43873997 is an equidigital number, since it uses as much as digits as its factorization.

43873997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 50.

The square root of 43873997 is about 6623.7449377222. The cubic root of 43873997 is about 352.6975155152.

The spelling of 43873997 in words is "forty-three million, eight hundred seventy-three thousand, nine hundred ninety-seven".