1157421 has 8 divisors (see below), whose sum is σ = 1552000. Its totient is φ = 767232.

The previous prime is 1157413. The next prime is 1157437. The reversal of 1157421 is 1247511.

It is a happy number.

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

It is not a de Polignac number, because 1157421 - 2³ = 1157413 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157491) 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, 421 + ... + 1578.

It is an arithmetic number, because the mean of its divisors is an integer number (194000).

2^1157421 is an apocalyptic number.

It is an amenable number.

1157421 is a deficient number, since it is larger than the sum of its proper divisors (394579).

1157421 is a wasteful number, since it uses less digits than its factorization.

1157421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2195.

The product of its digits is 280, while the sum is 21.

The square root of 1157421 is about 1075.8350245275. The cubic root of 1157421 is about 104.9938318372.

The spelling of 1157421 in words is "one million, one hundred fifty-seven thousand, four hundred twenty-one".