1391402012 has 72 divisors (see below), whose sum is σ = 3287394432. Its totient is φ = 500385600.

The previous prime is 1391402011. The next prime is 1391402039. The reversal of 1391402012 is 2102041931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391402011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38687 + ... + 65417.

It is an arithmetic number, because the mean of its divisors is an integer number (45658256).

Almost surely, 2^1391402012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1391402012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1643697216).

1391402012 is an abundant number, since it is smaller than the sum of its proper divisors (1895992420).

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

1391402012 is a wasteful number, since it uses less digits than its factorization.

1391402012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26779 (or 26764 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1391402012 is about 37301.5014711204. The cubic root of 1391402012 is about 1116.3941249574.

Adding to 1391402012 its reverse (2102041931), we get a palindrome (3493443943).

The spelling of 1391402012 in words is "one billion, three hundred ninety-one million, four hundred two thousand, twelve".