1397943670 has 8 divisors (see below), whose sum is σ = 2516298624. Its totient is φ = 559177464.

The previous prime is 1397943661. The next prime is 1397943671. The reversal of 1397943670 is 763497931.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397943671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69897174 + ... + 69897193.

It is an arithmetic number, because the mean of its divisors is an integer number (314537328).

Almost surely, 2^1397943670 is an apocalyptic number.

1397943670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1397943670 is a deficient number, since it is larger than the sum of its proper divisors (1118354954).

1397943670 is a wasteful number, since it uses less digits than its factorization.

1397943670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139794374.

The product of its (nonzero) digits is 857304, while the sum is 49.

The square root of 1397943670 is about 37389.0849045547. The cubic root of 1397943670 is about 1118.1409609313.

The spelling of 1397943670 in words is "one billion, three hundred ninety-seven million, nine hundred forty-three thousand, six hundred seventy".