1396902780 has 576 divisors, whose sum is σ = 5662863360. Its totient is φ = 283046400.

The previous prime is 1396902763. The next prime is 1396902791. The reversal of 1396902780 is 872096931.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 10663315 + ... + 10663445.

It is an arithmetic number, because the mean of its divisors is an integer number (9831360).

Almost surely, 2^1396902780 is an apocalyptic number.

1396902780 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 1396902780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2831431680).

1396902780 is an abundant number, since it is smaller than the sum of its proper divisors (4265960580).

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

1396902780 is a wasteful number, since it uses less digits than its factorization.

1396902780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 1396902780 is about 37375.1626083419. The cubic root of 1396902780 is about 1117.8633744652.

The spelling of 1396902780 in words is "one billion, three hundred ninety-six million, nine hundred two thousand, seven hundred eighty".