1397222928 has 120 divisors (see below), whose sum is σ = 4241587896. Its totient is φ = 427622400.

The previous prime is 1397222927. The next prime is 1397222933. The reversal of 1397222928 is 8292227931.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 126157824 + 1271065104 = 11232^2 + 35652^2 .

It is not an unprimeable number, because it can be changed into a prime (1397222927) 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, 93408 + ... + 107328.

Almost surely, 2^1397222928 is an apocalyptic number.

1397222928 is a gapful number since it is divisible by the number (18) 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 1397222928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2120793948).

1397222928 is an abundant number, since it is smaller than the sum of its proper divisors (2844364968).

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

1397222928 is a wasteful number, since it uses less digits than its factorization.

1397222928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13993 (or 13984 counting only the distinct ones).

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

The square root of 1397222928 is about 37379.4452607312. The cubic root of 1397222928 is about 1117.9487668041.

The spelling of 1397222928 in words is "one billion, three hundred ninety-seven million, two hundred twenty-two thousand, nine hundred twenty-eight".