1901398 has 4 divisors (see below), whose sum is σ = 2852100. Its totient is φ = 950698.

The previous prime is 1901377. The next prime is 1901407. The reversal of 1901398 is 8931091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8931091 = 13 ⋅687007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 475348 + ... + 475351.

It is an arithmetic number, because the mean of its divisors is an integer number (713025).

2^1901398 is an apocalyptic number.

1901398 is a deficient number, since it is larger than the sum of its proper divisors (950702).

1901398 is an equidigital number, since it uses as much as digits as its factorization.

1901398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950701.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 1901398 is about 1378.9118898610. The cubic root of 1901398 is about 123.8866028864.

The spelling of 1901398 in words is "one million, nine hundred one thousand, three hundred ninety-eight".