161402340 has 192 divisors, whose sum is σ = 529966080. Its totient is φ = 36288000.

The previous prime is 161402323. The next prime is 161402341. The reversal of 161402340 is 43204161.

It is not an unprimeable number, because it can be changed into a prime (161402341) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 764835 + ... + 765045.

It is an arithmetic number, because the mean of its divisors is an integer number (2760240).

Almost surely, 2^161402340 is an apocalyptic number.

161402340 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 161402340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264983040).

161402340 is an abundant number, since it is smaller than the sum of its proper divisors (368563740).

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

161402340 is a wasteful number, since it uses less digits than its factorization.

161402340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 161402340 is about 12704.4220647773. The cubic root of 161402340 is about 544.4649688531.

The spelling of 161402340 in words is "one hundred sixty-one million, four hundred two thousand, three hundred forty".