2451994 has 4 divisors (see below), whose sum is σ = 3677994. Its totient is φ = 1225996.

The previous prime is 2451991. The next prime is 2452003. The reversal of 2451994 is 4991542.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4991542 = 2 ⋅2495771.

It can be written as a sum of positive squares in only one way, i.e., 2442969 + 9025 = 1563^2 + 95^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2451991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612997 + ... + 613000.

2^2451994 is an apocalyptic number.

2451994 is a deficient number, since it is larger than the sum of its proper divisors (1226000).

2451994 is a wasteful number, since it uses less digits than its factorization.

2451994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225999.

The product of its digits is 12960, while the sum is 34.

The square root of 2451994 is about 1565.8844146360. The cubic root of 2451994 is about 134.8465380087.

The spelling of 2451994 in words is "two million, four hundred fifty-one thousand, nine hundred ninety-four".