249161540 has 24 divisors (see below), whose sum is σ = 523884480. Its totient is φ = 99541728.

The previous prime is 249161527. The next prime is 249161557. The reversal of 249161540 is 45161942.

It is a junction number, because it is equal to n+sod(n) for n = 249161497 and 249161506.

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, 9929 + ... + 24431.

It is an arithmetic number, because the mean of its divisors is an integer number (21828520).

Almost surely, 2^249161540 is an apocalyptic number.

249161540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

249161540 is an abundant number, since it is smaller than the sum of its proper divisors (274722940).

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

249161540 is a wasteful number, since it uses less digits than its factorization.

249161540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15371 (or 15369 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 249161540 is about 15784.8515989223. The cubic root of 249161540 is about 629.2554738805.

The spelling of 249161540 in words is "two hundred forty-nine million, one hundred sixty-one thousand, five hundred forty".