161039740 has 24 divisors (see below), whose sum is σ = 339962112. Its totient is φ = 64077120.

The previous prime is 161039737. The next prime is 161039771. The reversal of 161039740 is 47930161.

It is a happy number.

161039740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17259 + ... + 24898.

It is an arithmetic number, because the mean of its divisors is an integer number (14165088).

Almost surely, 2^161039740 is an apocalyptic number.

161039740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161039740 is an abundant number, since it is smaller than the sum of its proper divisors (178922372).

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

161039740 is a wasteful number, since it uses less digits than its factorization.

161039740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42357 (or 42355 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 161039740 is about 12690.1434192053. The cubic root of 161039740 is about 544.0569387850.

The spelling of 161039740 in words is "one hundred sixty-one million, thirty-nine thousand, seven hundred forty".