1540397 has 8 divisors (see below), whose sum is σ = 1587936. Its totient is φ = 1493712.

The previous prime is 1540367. The next prime is 1540403. The reversal of 1540397 is 7930451.

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

It is a cyclic number.

It is not a de Polignac number, because 1540397 - 2⁸ = 1540141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540337) 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, 5423 + ... + 5699.

It is an arithmetic number, because the mean of its divisors is an integer number (198492).

2^1540397 is an apocalyptic number.

It is an amenable number.

1540397 is a deficient number, since it is larger than the sum of its proper divisors (47539).

1540397 is an equidigital number, since it uses as much as digits as its factorization.

1540397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 1540397 is about 1241.1273101499. The cubic root of 1540397 is about 115.4899574610.

The spelling of 1540397 in words is "one million, five hundred forty thousand, three hundred ninety-seven".