1390821697 has 8 divisors (see below), whose sum is σ = 1503968256. Its totient is φ = 1281156672.

The previous prime is 1390821647. The next prime is 1390821703. The reversal of 1390821697 is 7961280931.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1390821697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1390821637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 869553 + ... + 871150.

It is an arithmetic number, because the mean of its divisors is an integer number (187996032).

Almost surely, 2^1390821697 is an apocalyptic number.

1390821697 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1390821697 is a deficient number, since it is larger than the sum of its proper divisors (113146559).

1390821697 is a wasteful number, since it uses less digits than its factorization.

1390821697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740767.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 1390821697 is about 37293.7219515564. The cubic root of 1390821697 is about 1116.2388977501.

The spelling of 1390821697 in words is "one billion, three hundred ninety million, eight hundred twenty-one thousand, six hundred ninety-seven".