126856890 has 48 divisors (see below), whose sum is σ = 349233768. Its totient is φ = 31838208.

The previous prime is 126856889. The next prime is 126856897. The reversal of 126856890 is 98658621.

It can be written as a sum of positive squares in 4 ways, for example, as 101545929 + 25310961 = 10077^2 + 5031^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (126856897) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39927 + ... + 42986.

Almost surely, 2^126856890 is an apocalyptic number.

126856890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

126856890 is an abundant number, since it is smaller than the sum of its proper divisors (222376878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

126856890 is a wasteful number, since it uses less digits than its factorization.

126856890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82943 (or 82940 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 126856890 is about 11263.0764003446. The cubic root of 126856890 is about 502.4636938201.

The spelling of 126856890 in words is "one hundred twenty-six million, eight hundred fifty-six thousand, eight hundred ninety".