126993478 has 4 divisors (see below), whose sum is σ = 190490220. Its totient is φ = 63496738.

The previous prime is 126993457. The next prime is 126993487. The reversal of 126993478 is 874399621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 874399621 = 73 ⋅11978077.

It is a super-2 number, since 2×126993478² = 32254686909072968, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31748368 + ... + 31748371.

It is an arithmetic number, because the mean of its divisors is an integer number (47622555).

Almost surely, 2^126993478 is an apocalyptic number.

126993478 is a deficient number, since it is larger than the sum of its proper divisors (63496742).

126993478 is an equidigital number, since it uses as much as digits as its factorization.

126993478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63496741.

The product of its digits is 653184, while the sum is 49.

The square root of 126993478 is about 11269.1382989118. The cubic root of 126993478 is about 502.6439649220.

The spelling of 126993478 in words is "one hundred twenty-six million, nine hundred ninety-three thousand, four hundred seventy-eight".