1397772380 has 48 divisors (see below), whose sum is σ = 2964971520. Its totient is φ = 553492800.

The previous prime is 1397772329. The next prime is 1397772401. The reversal of 1397772380 is 832777931.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 912215 + ... + 913745.

It is an arithmetic number, because the mean of its divisors is an integer number (61770240).

Almost surely, 2^1397772380 is an apocalyptic number.

1397772380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1397772380 is an abundant number, since it is smaller than the sum of its proper divisors (1567199140).

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

1397772380 is a wasteful number, since it uses less digits than its factorization.

1397772380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1970 (or 1968 counting only the distinct ones).

The product of its (nonzero) digits is 444528, while the sum is 47.

The square root of 1397772380 is about 37386.7941926023. The cubic root of 1397772380 is about 1118.0952904720.

The spelling of 1397772380 in words is "one billion, three hundred ninety-seven million, seven hundred seventy-two thousand, three hundred eighty".