161649340 has 24 divisors (see below), whose sum is σ = 357330960. Its totient is φ = 61256448.

The previous prime is 161649307. The next prime is 161649349. The reversal of 161649340 is 43946161.

It is a super-2 number, since 2×161649340² = 52261018244871200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161649296 and 161649305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161649349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212317 + ... + 213076.

It is an arithmetic number, because the mean of its divisors is an integer number (14888790).

Almost surely, 2^161649340 is an apocalyptic number.

161649340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161649340 is an abundant number, since it is smaller than the sum of its proper divisors (195681620).

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

161649340 is a wasteful number, since it uses less digits than its factorization.

161649340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425421 (or 425419 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 161649340 is about 12714.1393731546. The cubic root of 161649340 is about 544.7425656220.

The spelling of 161649340 in words is "one hundred sixty-one million, six hundred forty-nine thousand, three hundred forty".