91439240 has 16 divisors (see below), whose sum is σ = 205738380. Its totient is φ = 36575680.

The previous prime is 91439213. The next prime is 91439263. The reversal of 91439240 is 4293419.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 91431844 + 7396 = 9562^2 + 86^2 .

It is a super-2 number, since 2×91439240² = 16722269223555200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91439197 and 91439206.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1142951 + ... + 1143030.

Almost surely, 2^91439240 is an apocalyptic number.

It is an amenable number.

91439240 is an abundant number, since it is smaller than the sum of its proper divisors (114299140).

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

91439240 is a wasteful number, since it uses less digits than its factorization.

91439240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285992 (or 2285988 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 91439240 is about 9562.3867313553. The cubic root of 91439240 is about 450.5166740359.

The spelling of 91439240 in words is "ninety-one million, four hundred thirty-nine thousand, two hundred forty".