161469440 has 176 divisors, whose sum is σ = 438614784. Its totient is φ = 56524800.

The previous prime is 161469437. The next prime is 161469479. The reversal of 161469440 is 44964161.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (176).

It is a self number, because there is not a number n which added to its sum of digits gives 161469440.

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, 2647010 + ... + 2647070.

Almost surely, 2^161469440 is an apocalyptic number.

161469440 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 161469440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219307392).

161469440 is an abundant number, since it is smaller than the sum of its proper divisors (277145344).

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

161469440 is a wasteful number, since it uses less digits than its factorization.

161469440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 161469440 is about 12707.0626031353. The cubic root of 161469440 is about 544.5404087711.

The spelling of 161469440 in words is "one hundred sixty-one million, four hundred sixty-nine thousand, four hundred forty".