81402126 has 16 divisors (see below), whose sum is σ = 175327824. Its totient is φ = 25046784.

The previous prime is 81402089. The next prime is 81402131. The reversal of 81402126 is 62120418.

It is a super-2 number, since 2×81402126² = 13252612234639752, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81402096 and 81402105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 521731 + ... + 521886.

It is an arithmetic number, because the mean of its divisors is an integer number (10957989).

Almost surely, 2^81402126 is an apocalyptic number.

81402126 is an abundant number, since it is smaller than the sum of its proper divisors (93925698).

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

81402126 is a wasteful number, since it uses less digits than its factorization.

81402126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043635.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 81402126 is about 9022.3126746971. The cubic root of 81402126 is about 433.3896969420.

The spelling of 81402126 in words is "eighty-one million, four hundred two thousand, one hundred twenty-six".