125421534 has 56 divisors (see below), whose sum is σ = 322391280. Its totient is φ = 35831808.

The previous prime is 125421533. The next prime is 125421589. The reversal of 125421534 is 435124521.

125421534 is a `hidden beast` number, since 125 + 4 + 2 + 1 + 534 = 666.

It is a super-2 number, since 2×125421534² = 31461122381826312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 125421498 and 125421507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125421533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 4062 + ... + 16350.

Almost surely, 2^125421534 is an apocalyptic number.

125421534 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 125421534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161195640).

125421534 is an abundant number, since it is smaller than the sum of its proper divisors (196969746).

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

125421534 is an equidigital number, since it uses as much as digits as its factorization.

125421534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12316 (or 12301 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 125421534 is about 11199.1755946587. The cubic root of 125421534 is about 500.5614147244.

The spelling of 125421534 in words is "one hundred twenty-five million, four hundred twenty-one thousand, five hundred thirty-four".