161349740 has 24 divisors (see below), whose sum is σ = 340163712. Its totient is φ = 64286720.

The previous prime is 161349739. The next prime is 161349743. The reversal of 161349740 is 47943161.

It is a self number, because there is not a number n which added to its sum of digits gives 161349740.

It is not an unprimeable number, because it can be changed into a prime (161349743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10556 + ... + 20835.

It is an arithmetic number, because the mean of its divisors is an integer number (14173488).

Almost surely, 2^161349740 is an apocalyptic number.

161349740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161349740 is an abundant number, since it is smaller than the sum of its proper divisors (178813972).

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

161349740 is a wasteful number, since it uses less digits than its factorization.

161349740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31657 (or 31655 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 161349740 is about 12702.3517507586. The cubic root of 161349740 is about 544.4058165323.

The spelling of 161349740 in words is "one hundred sixty-one million, three hundred forty-nine thousand, seven hundred forty".