1642994 has 4 divisors (see below), whose sum is σ = 2464494. Its totient is φ = 821496.

The previous prime is 1642951. The next prime is 1642997. The reversal of 1642994 is 4992461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1452025 + 190969 = 1205^2 + 437^2 .

It is a super-4 number, since 4×1642994⁴ (a number of 26 digits) contains 4444 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1642997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410747 + ... + 410750.

2^1642994 is an apocalyptic number.

1642994 is a deficient number, since it is larger than the sum of its proper divisors (821500).

1642994 is an equidigital number, since it uses as much as digits as its factorization.

1642994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821499.

The product of its digits is 15552, while the sum is 35.

The square root of 1642994 is about 1281.7932750643. The cubic root of 1642994 is about 117.9990902927. Note that the first 3 decimals are identical.

The spelling of 1642994 in words is "one million, six hundred forty-two thousand, nine hundred ninety-four".