1997379216 has 80 divisors (see below), whose sum is σ = 6552259200. Its totient is φ = 570678912.

The previous prime is 1997379211. The next prime is 1997379221. The reversal of 1997379216 is 6129737991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1997379211) and next prime (1997379221).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1997379211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 327231 + ... + 333278.

It is an arithmetic number, because the mean of its divisors is an integer number (81903240).

Almost surely, 2^1997379216 is an apocalyptic number.

1997379216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1997379216 is an abundant number, since it is smaller than the sum of its proper divisors (4554879984).

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

1997379216 is a wasteful number, since it uses less digits than its factorization.

1997379216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660533 (or 660521 counting only the distinct ones).

The product of its digits is 1285956, while the sum is 54.

The square root of 1997379216 is about 44692.0486887768. The cubic root of 1997379216 is about 1259.3704791822.

The spelling of 1997379216 in words is "one billion, nine hundred ninety-seven million, three hundred seventy-nine thousand, two hundred sixteen".