161247400 has 48 divisors (see below), whose sum is σ = 381074940. Its totient is φ = 63436800.

The previous prime is 161247391. The next prime is 161247403. The reversal of 161247400 is 4742161.

It can be written as a sum of positive squares in 6 ways, for example, as 13527684 + 147719716 = 3678^2 + 12154^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (161247403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5592 + ... + 18808.

Almost surely, 2^161247400 is an apocalyptic number.

161247400 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 161247400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190537470).

161247400 is an abundant number, since it is smaller than the sum of its proper divisors (219827540).

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

161247400 is a wasteful number, since it uses less digits than its factorization.

161247400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13294 (or 13285 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 161247400 is about 12698.3227238876. The cubic root of 161247400 is about 544.2906913084.

Adding to 161247400 its reverse (4742161), we get a palindrome (165989561).

The spelling of 161247400 in words is "one hundred sixty-one million, two hundred forty-seven thousand, four hundred".