6409402 has 4 divisors (see below), whose sum is σ = 9614106. Its totient is φ = 3204700.

The previous prime is 6409397. The next prime is 6409409. The reversal of 6409402 is 2049046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2049046 = 2 ⋅1024523.

It can be written as a sum of positive squares in only one way, i.e., 4844401 + 1565001 = 2201^2 + 1251^2 .

It is a super-3 number, since 3×6409402³ (a number of 21 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (6409409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1602349 + ... + 1602352.

Almost surely, 2^6409402 is an apocalyptic number.

6409402 is a deficient number, since it is larger than the sum of its proper divisors (3204704).

6409402 is a wasteful number, since it uses less digits than its factorization.

6409402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3204703.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 6409402 is about 2531.6796795803. The cubic root of 6409402 is about 185.7544259811.

The spelling of 6409402 in words is "six million, four hundred nine thousand, four hundred two".