126947821 has 32 divisors (see below), whose sum is σ = 175988736. Its totient is φ = 88344000.

The previous prime is 126947813. The next prime is 126947837. The reversal of 126947821 is 128749621.

It is a cyclic number.

It is not a de Polignac number, because 126947821 - 2³ = 126947813 is a prime.

It is a super-2 number, since 2×126947821² = 32231498513296082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126947801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28986 + ... + 33076.

It is an arithmetic number, because the mean of its divisors is an integer number (5499648).

Almost surely, 2^126947821 is an apocalyptic number.

126947821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

126947821 is a deficient number, since it is larger than the sum of its proper divisors (49040915).

126947821 is a wasteful number, since it uses less digits than its factorization.

126947821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4153.

The product of its digits is 48384, while the sum is 40.

The square root of 126947821 is about 11267.1123629793. The cubic root of 126947821 is about 502.5837204468.

The spelling of 126947821 in words is "one hundred twenty-six million, nine hundred forty-seven thousand, eight hundred twenty-one".