1397961 has 12 divisors (see below), whose sum is σ = 2138292. Its totient is φ = 877056.

The previous prime is 1397959. The next prime is 1397983. The reversal of 1397961 is 1697931.

It can be written as a sum of positive squares in 2 ways, for example, as 435600 + 962361 = 660^2 + 981^2 .

It is not a de Polignac number, because 1397961 - 2¹ = 1397959 is a prime.

It is a super-3 number, since 3×1397961³ = 8196084399333044043, which contains 333 as substring.

1397961 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1397951) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4416 + ... + 4721.

It is an arithmetic number, because the mean of its divisors is an integer number (178191).

2^1397961 is an apocalyptic number.

It is an amenable number.

1397961 is a deficient number, since it is larger than the sum of its proper divisors (740331).

1397961 is a wasteful number, since it uses less digits than its factorization.

1397961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9160 (or 9157 counting only the distinct ones).

The product of its digits is 10206, while the sum is 36.

The square root of 1397961 is about 1182.3540079012. The cubic root of 1397961 is about 111.8145581361.

It can be divided in two parts, 139 and 7961, that added together give a square (8100 = 90²).

The spelling of 1397961 in words is "one million, three hundred ninety-seven thousand, nine hundred sixty-one".