1553990 has 8 divisors (see below), whose sum is σ = 2797200. Its totient is φ = 621592.

The previous prime is 1553983. The next prime is 1554019. The reversal of 1553990 is 993551.

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

It is a Curzon number.

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, 77690 + ... + 77709.

It is an arithmetic number, because the mean of its divisors is an integer number (349650).

2^1553990 is an apocalyptic number.

1553990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1553990 is a deficient number, since it is larger than the sum of its proper divisors (1243210).

1553990 is a wasteful number, since it uses less digits than its factorization.

1553990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155406.

The product of its (nonzero) digits is 6075, while the sum is 32.

The square root of 1553990 is about 1246.5913524487. The cubic root of 1553990 is about 115.8286709761.

The spelling of 1553990 in words is "one million, five hundred fifty-three thousand, nine hundred ninety".