125999947 has 4 divisors (see below), whose sum is σ = 126116320. Its totient is φ = 125883576.

The previous prime is 125999899. The next prime is 125999959. The reversal of 125999947 is 749999521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 125999947 - 2¹⁹ = 125475659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125996947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56547 + ... + 58732.

It is an arithmetic number, because the mean of its divisors is an integer number (31529080).

Almost surely, 2^125999947 is an apocalyptic number.

125999947 is a deficient number, since it is larger than the sum of its proper divisors (116373).

125999947 is a wasteful number, since it uses less digits than its factorization.

125999947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116372.

The product of its digits is 1837080, while the sum is 55.

The square root of 125999947 is about 11224.9697995139. The cubic root of 125999947 is about 501.3297232042.

The spelling of 125999947 in words is "one hundred twenty-five million, nine hundred ninety-nine thousand, nine hundred forty-seven".