1397632194 has 108 divisors (see below), whose sum is σ = 3586094694. Its totient is φ = 392249088.

The previous prime is 1397632193. The next prime is 1397632199. The reversal of 1397632194 is 4912367931.

1397632194 is a `hidden beast` number, since 1 + 3 + 9 + 7 + 632 + 1 + 9 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1237280625 + 160351569 = 35175^2 + 12663^2 .

Its product of digits (244944) is a multiple of the sum of its prime divisors (432).

It is not an unprimeable number, because it can be changed into a prime (1397632193) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 3959122 + ... + 3959474.

Almost surely, 2^1397632194 is an apocalyptic number.

1397632194 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1397632194, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1793047347).

1397632194 is an abundant number, since it is smaller than the sum of its proper divisors (2188462500).

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

1397632194 is a wasteful number, since it uses less digits than its factorization.

1397632194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509 (or 432 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 1397632194 is about 37384.9193392202. The cubic root of 1397632194 is about 1118.0579103881.

The spelling of 1397632194 in words is "one billion, three hundred ninety-seven million, six hundred thirty-two thousand, one hundred ninety-four".