126402547 has 4 divisors (see below), whose sum is σ = 126505000. Its totient is φ = 126300096.

The previous prime is 126402539. The next prime is 126402571. The reversal of 126402547 is 745204621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 745204621 = 7 ⋅106457803.

It is a cyclic number.

It is not a de Polignac number, because 126402547 - 2³ = 126402539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126402047) 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, 49353 + ... + 51850.

It is an arithmetic number, because the mean of its divisors is an integer number (31626250).

Almost surely, 2^126402547 is an apocalyptic number.

126402547 is a deficient number, since it is larger than the sum of its proper divisors (102453).

126402547 is a wasteful number, since it uses less digits than its factorization.

126402547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102452.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 126402547 is about 11242.8887302152. Note that the first 3 decimals coincide. The cubic root of 126402547 is about 501.8631116735.

The spelling of 126402547 in words is "one hundred twenty-six million, four hundred two thousand, five hundred forty-seven".