1321900 has 18 divisors (see below), whose sum is σ = 2868740. Its totient is φ = 528720.

The previous prime is 1321897. The next prime is 1321919. The reversal of 1321900 is 91231.

1321900 = T₁₄₉ + T₁₅₀ + ... + T₂₂₃.

It is a super-2 number, since 2×1321900² = 3494839220000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6510 + ... + 6709.

2^1321900 is an apocalyptic number.

1321900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321900 is an abundant number, since it is smaller than the sum of its proper divisors (1546840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321900 is a wasteful number, since it uses less digits than its factorization.

1321900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13233 (or 13226 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1321900 is about 1149.7391008398. The cubic root of 1321900 is about 109.7487377982.

The spelling of 1321900 in words is "one million, three hundred twenty-one thousand, nine hundred".