1397642 has 4 divisors (see below), whose sum is σ = 2096466. Its totient is φ = 698820.

The previous prime is 1397633. The next prime is 1397657. The reversal of 1397642 is 2467931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1002001 + 395641 = 1001^2 + 629^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1397599 and 1397608.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349409 + ... + 349412.

2^1397642 is an apocalyptic number.

1397642 is a deficient number, since it is larger than the sum of its proper divisors (698824).

1397642 is an equidigital number, since it uses as much as digits as its factorization.

1397642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698823.

The product of its digits is 9072, while the sum is 32.

The square root of 1397642 is about 1182.2190998288. The cubic root of 1397642 is about 111.8060525203.

The spelling of 1397642 in words is "one million, three hundred ninety-seven thousand, six hundred forty-two".