1890157 has 4 divisors (see below), whose sum is σ = 1897120. Its totient is φ = 1883196.

The previous prime is 1890149. The next prime is 1890167. The reversal of 1890157 is 7510981.

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: 7510981 = 193 ⋅38917.

It is a cyclic number.

It is not a de Polignac number, because 1890157 - 2³ = 1890149 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 (1890107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3057 + ... + 3622.

It is an arithmetic number, because the mean of its divisors is an integer number (474280).

2^1890157 is an apocalyptic number.

It is an amenable number.

1890157 is a deficient number, since it is larger than the sum of its proper divisors (6963).

1890157 is an equidigital number, since it uses as much as digits as its factorization.

1890157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6962.

The product of its (nonzero) digits is 2520, while the sum is 31.

The square root of 1890157 is about 1374.8298076489. The cubic root of 1890157 is about 123.6419824010.

The spelling of 1890157 in words is "one million, eight hundred ninety thousand, one hundred fifty-seven".