1397151616 has 64 divisors (see below), whose sum is σ = 3219511680. Its totient is φ = 591533568.

The previous prime is 1397151607. The next prime is 1397151641. The reversal of 1397151616 is 6161517931.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×1397151616² = 3904065276182822912, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64975 + ... + 83761.

It is an arithmetic number, because the mean of its divisors is an integer number (50304870).

Almost surely, 2^1397151616 is an apocalyptic number.

1397151616 is a gapful number since it is divisible by the number (16) 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 1397151616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1609755840).

1397151616 is an abundant number, since it is smaller than the sum of its proper divisors (1822360064).

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

1397151616 is an equidigital number, since it uses as much as digits as its factorization.

1397151616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18891 (or 18879 counting only the distinct ones).

The product of its digits is 34020, while the sum is 40.

The square root of 1397151616 is about 37378.4913553236. The cubic root of 1397151616 is about 1117.9297470478.

The spelling of 1397151616 in words is "one billion, three hundred ninety-seven million, one hundred fifty-one thousand, six hundred sixteen".