161941440 has 112 divisors (see below), whose sum is σ = 526255488. Its totient is φ = 42169344.

The previous prime is 161941421. The next prime is 161941457. The reversal of 161941440 is 44149161.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 161941398 and 161941407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39319 + ... + 43241.

Almost surely, 2^161941440 is an apocalyptic number.

161941440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161941440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263127744).

161941440 is an abundant number, since it is smaller than the sum of its proper divisors (364314048).

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

161941440 is a wasteful number, since it uses less digits than its factorization.

161941440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3986 (or 3976 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 161941440 is about 12725.6213993659. The cubic root of 161941440 is about 545.0704843890.

The spelling of 161941440 in words is "one hundred sixty-one million, nine hundred forty-one thousand, four hundred forty".