1397249280 has 216 divisors, whose sum is σ = 5525275392. Its totient is φ = 319352832.

The previous prime is 1397249279. The next prime is 1397249297. The reversal of 1397249280 is 829427931.

1397249280 is a `hidden beast` number, since 13 + 9 + 72 + 492 + 80 = 666.

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 23 ways as a sum of consecutive naturals, for example, 71977 + ... + 89303.

Almost surely, 2^1397249280 is an apocalyptic number.

1397249280 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 1397249280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2762637696).

1397249280 is an abundant number, since it is smaller than the sum of its proper divisors (4128026112).

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

1397249280 is a wasteful number, since it uses less digits than its factorization.

1397249280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17361 (or 17344 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1397249280 is about 37379.7977522618. The cubic root of 1397249280 is about 1117.9557950313.

The spelling of 1397249280 in words is "one billion, three hundred ninety-seven million, two hundred forty-nine thousand, two hundred eighty".