1642157 has 4 divisors (see below), whose sum is σ = 1791456. Its totient is φ = 1492860.

The previous prime is 1642153. The next prime is 1642187. The reversal of 1642157 is 7512461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7512461 = 11 ⋅682951.

It is a cyclic number.

It is not a de Polignac number, because 1642157 - 2² = 1642153 is a prime.

It is a super-2 number, since 2×1642157² = 5393359225298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74633 + ... + 74654.

It is an arithmetic number, because the mean of its divisors is an integer number (447864).

2^1642157 is an apocalyptic number.

It is an amenable number.

1642157 is a deficient number, since it is larger than the sum of its proper divisors (149299).

1642157 is a wasteful number, since it uses less digits than its factorization.

1642157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149298.

The product of its digits is 1680, while the sum is 26.

The square root of 1642157 is about 1281.4667377658. The cubic root of 1642157 is about 117.9790492346.

The spelling of 1642157 in words is "one million, six hundred forty-two thousand, one hundred fifty-seven".