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1990278 = 23336857
BaseRepresentation
bin111100101111010000110
310202010011000
413211322012
51002142103
6110354130
722626363
oct7457206
93663130
101990278
11113a364
127bb946
13548ba4
1439b46a
15294aa3
hex1e5e86

1990278 has 16 divisors (see below), whose sum is σ = 4422960. Its totient is φ = 663408.

The previous prime is 1990277. The next prime is 1990279. The reversal of 1990278 is 8720991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1990277) and next prime (1990279).

It is a super-2 number, since 2×19902782 = 7922413034568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18375 + ... + 18482.

It is an arithmetic number, because the mean of its divisors is an integer number (276435).

21990278 is an apocalyptic number.

1990278 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1990278 is an abundant number, since it is smaller than the sum of its proper divisors (2432682).

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

1990278 is a wasteful number, since it uses less digits than its factorization.

1990278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36868 (or 36862 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 1990278 is about 1410.7721290130. The cubic root of 1990278 is about 125.7876240960.

The spelling of 1990278 in words is "one million, nine hundred ninety thousand, two hundred seventy-eight".

Divisors: 1 2 3 6 9 18 27 54 36857 73714 110571 221142 331713 663426 995139 1990278