81400132 has 24 divisors (see below), whose sum is σ = 155629152. Its totient is φ = 36945600.

The previous prime is 81400093. The next prime is 81400171. The reversal of 81400132 is 23100418.

It is an interprime number because it is at equal distance from previous prime (81400093) and next prime (81400171).

It is a super-4 number, since 4×81400132⁴ (a number of 33 digits) contains 4444 as substring.

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, 56088 + ... + 57520.

It is an arithmetic number, because the mean of its divisors is an integer number (6484548).

Almost surely, 2^81400132 is an apocalyptic number.

It is an amenable number.

81400132 is a deficient number, since it is larger than the sum of its proper divisors (74229020).

81400132 is a wasteful number, since it uses less digits than its factorization.

81400132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2739 (or 2737 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 81400132 is about 9022.2021702021. The cubic root of 81400132 is about 433.3861581887.

The spelling of 81400132 in words is "eighty-one million, four hundred thousand, one hundred thirty-two".