1994874397 has 4 divisors (see below), whose sum is σ = 2059225216. Its totient is φ = 1930523580.

The previous prime is 1994874389. The next prime is 1994874451. The reversal of 1994874397 is 7934784991.

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.

It is a cyclic number.

It is not a de Polignac number, because 1994874397 - 2³ = 1994874389 is a prime.

It is a super-2 number, since 2×1994874397² = 7959047719612227218, 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 (1994874337) 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, 32175363 + ... + 32175424.

It is an arithmetic number, because the mean of its divisors is an integer number (514806304).

Almost surely, 2^1994874397 is an apocalyptic number.

It is an amenable number.

1994874397 is a deficient number, since it is larger than the sum of its proper divisors (64350819).

1994874397 is an equidigital number, since it uses as much as digits as its factorization.

1994874397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64350818.

The product of its digits is 13716864, while the sum is 61.

The square root of 1994874397 is about 44664.0168032388. The cubic root of 1994874397 is about 1258.8438199424.

The spelling of 1994874397 in words is "one billion, nine hundred ninety-four million, eight hundred seventy-four thousand, three hundred ninety-seven".