161257340 has 12 divisors (see below), whose sum is σ = 338640456. Its totient is φ = 64502928.

The previous prime is 161257337. The next prime is 161257373. The reversal of 161257340 is 43752161.

It is a congruent number.

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, 4031414 + ... + 4031453.

It is an arithmetic number, because the mean of its divisors is an integer number (28220038).

Almost surely, 2^161257340 is an apocalyptic number.

161257340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161257340 is an abundant number, since it is smaller than the sum of its proper divisors (177383116).

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

161257340 is a wasteful number, since it uses less digits than its factorization.

161257340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8062876 (or 8062874 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 161257340 is about 12698.7141081292. The cubic root of 161257340 is about 544.3018752371.

The spelling of 161257340 in words is "one hundred sixty-one million, two hundred fifty-seven thousand, three hundred forty".