1390781304 has 192 divisors, whose sum is σ = 4475952000. Its totient is φ = 385378560.

The previous prime is 1390781297. The next prime is 1390781311. The reversal of 1390781304 is 4031870931.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1390781297) and next prime (1390781311).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 434799 + ... + 437985.

It is an arithmetic number, because the mean of its divisors is an integer number (23312250).

Almost surely, 2^1390781304 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 1390781304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2237976000).

1390781304 is an abundant number, since it is smaller than the sum of its proper divisors (3085170696).

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

1390781304 is a wasteful number, since it uses less digits than its factorization.

1390781304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3258 (or 3251 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 1390781304 is about 37293.1803953484. The cubic root of 1390781304 is about 1116.2280915065.

The spelling of 1390781304 in words is "one billion, three hundred ninety million, seven hundred eighty-one thousand, three hundred four".