1551406 has 8 divisors (see below), whose sum is σ = 2336184. Its totient is φ = 772680.

The previous prime is 1551383. The next prime is 1551449. The reversal of 1551406 is 6041551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 805 + ... + 1936.

It is an arithmetic number, because the mean of its divisors is an integer number (292023).

2^1551406 is an apocalyptic number.

1551406 is a deficient number, since it is larger than the sum of its proper divisors (784778).

1551406 is a wasteful number, since it uses less digits than its factorization.

1551406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3026.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1551406 is about 1245.5544949941. The cubic root of 1551406 is about 115.7644347555.

Adding to 1551406 its reverse (6041551), we get a palindrome (7592957).

The spelling of 1551406 in words is "one million, five hundred fifty-one thousand, four hundred six".